Castrol oil in gearbox and transmission. Oils for mechanical transmissions

24.09.2019

Castrol gear oil has been produced for several decades. Castrol pays special attention to the manufacture and development of synthetic oils that are used in automatic and manual transmissions. Unlike its competitors, the manufacturer has a wide range of gear lubricants that are suitable for any car model.

Castrol gear oil was first developed for sports racing cars. Today the company has a good reputation for quality, guarantees of its products and reliability of the gearbox. In the production of synthetic gear oil, the latest equipment is used. Today, the Castrol brand is at the peak of popularity and is sold in all countries of the world.

The company that sells gear oil has a wide range of synthetic and mineral counterparts. They are capable of providing excellent shifting performance at low temperatures. Only gear oil with antioxidant properties can give excellent performance to gearbox parts. A lubricant with antifriction properties provides a lower heating temperature for a working gearbox.

Characteristics of lubricants from Castrol

Synthetic-based Castrol oil ensures good operation of the drive axle and gearbox, which gives a quick start to the engine. With oil having a minimal base, all transmission parts are kept clean. Castrol grease has excellent viscosity and is perfectly suitable for drive axles of any model of a foreign car or a domestic car. Good fluidity of the oil during temperature fluctuations allows the engine to remain in perfect condition.

Castrol oil, which is resistant to low temperatures, perfectly penetrates all mechanical components. If you use it in steering, then the coordination of the car improves in the winter. This makes it possible to avoid an accident and protects the valves from stress and rapid wear. If you characterize Castrol gear oil based on minerals, then it is somewhat inferior to synthetic-based lubricants that are used in transmissions.

The performance is directly related to friction reduction and excellent fluidity. Due to this, the car begins to consume less fuel, the engine starts even in winter with a half turn. Castrol oil reduces not only the friction process, but also reduces the heating time of the axle and automatic transmission, makes the use of the car more comfortable and easier.

Castrol gear oil contains high-quality additives that help protect engine parts from wear and tear. It can work well in difficult conditions. Castrol oil is suitable for use in cars not only of foreign manufacturers, but also of the domestic auto industry.

Gearbox oils with index 75W-90

Castrol oil with an index of 75W90 is a quality synthetic-based lubricant. It has anti-seize characteristics and is perfectly combined with the synchronizer. It is usually used in a gearbox with a drive axle or in a manual transmission. The wide viscosity range of 75W90 oil, its excellent antioxidant properties help to get rid of carbon deposits and other deposits in transmission units. The main advantages of such a lubricant can be called the following features.

Transmission parts are always kept clean, this is due to the fact that Castrol 75W90 oil is resistant to elevated temperatures. The transmission product of this company for a manual transmission allows us to conclude that the quality of the final product is in the forefront of the company. For machines with manual gearboxes, a line of oils has been developed that can work not only in different operating conditions, but also in different climate zones.

These products feel great at low and high temperatures. The manual transmission is completely protected from wear, scuffing and other problems that appear when using low-quality lubricant. Among the car manufacturers that use Castrol brand gear oils are Jaguar, BMW, Lamborghini, Volvo and Mitsubishi. All of them recommend the use of lubricants of the represented brand, emphasizing their quality and other positive characteristics.

Other types of lubricants for transmission

Synthetic oil Castrol 75W-90-90 is excellent for manual transmissions. It is considered a reliable tool for working in cold climates. Its advantages include reliability in operation, ease of shifting the gearshift lever from neutral to a certain gear (even at sub-zero temperatures). Lubrication reduces the noise level of the motor, has a constant viscosity index during the entire period of operation. Excellent thermal stability is observed. No deposits appear and the BC lasts longer.

Castrol Syntrans B 75W synthetic oil is approved for use in heavy duty manual gearboxes in BMW vehicles. Reliably and quickly shifts gears in winter. Such a transmission oil can protect against wear and burrs that appear on parts during excessive loads. It has proven itself in the work of gears with final drives, in manual gearboxes. Proposed for use in 6-speed manual gearboxes of Audi, Skoda cars.

The advantage of such a lubricant is not only an anti-wear property, but also a reduction in gasoline consumption. The excellent protection of parts and components of the motor in low temperature conditions, high-quality gear shifting are highly appreciated. Shear stability guarantees the quality of the lubricant throughout the entire period of use. KP parts are always clean, the transmission is not subjected to unnecessary stress.

Each transmission lubricant has its own characteristics and benefits. You just need to stock up on knowledge and choose the one that suits a particular machine.

If there is not enough knowledge, then you can get qualified advice from mechanics at a service station. Experts with experience can suggest a lot of practical and useful. It is worth talking with more experienced motorists. Thanks to their many years of practice, they can give advice and help in difficult choices. What lubricant to use for high-quality operation of the motor and transmission? This is the choice of the owner of the car.

For every car owner, the reliability of his vehicle is important, and as the complexity of mechanical transmissions increases over time, the question arises of creating new fluids with high manufacturability, for example, Castrol gear oil. So that the ride does not cause inconvenience, but, on the contrary, brings positive emotions, it is important to take care of the selection of oil for your iron horse in time, because the clarity of the gearbox depends on this.

Castrol has been producing transmission fluids and creating new types of them for several years - the company has more than a century of experience in this area. It is not without reason that this manufacturer is trusted by many leading auto concerns, and it is not for nothing that they use the oil of this particular brand for factory refueling.

The Castrol line includes a huge variety of fluids for mechanical transmissions, in which there is an optimal one for a car with any characteristics, which distinguishes this company from competitors. This allows us to rightfully call Castrol a universal brand in the field of automotive lubricants.

Synthetic gear oil for automatic and manual transmissions occupies a special place among the entire range of manufactured fluids in the Castrol line. Initially it was created for sports cars, but now the target group is much wider. Castrol products are in high demand due to the quality assurance and the latest technologies in which they are manufactured.

Thanks to Castrol synthetically produced oil, the drive axle and gearbox work smoothly, which helps to quickly start the engine. And mineral-based oil keeps all transmission parts clean. Lubricants from Castrol have good fluidity, so even a temperature difference will not disturb the excellent condition of the engine.

By reducing friction and the already mentioned excellent fluidity, fuel consumption is reduced, the engine starts even at low temperatures, while the axle and gearbox warm up quickly enough, which means that it becomes more comfortable to use the car.

Castrol oils contain high quality additives that protect engine parts from premature wear. At the same time, Castrol products can be selected for any model of both foreign cars and the domestic auto industry.

Gearbox oils with index 75w90

One of the most sought-after oils in the Castrol line is with the 75w90 index, and numerous reviews confirm this. Buyers note the fact of noise reduction when using this oil, its high quality and convenient packaging.

If you look from a professional point of view, when describing the characteristics of the oil, one cannot fail to mention its antioxidant properties and a wide range of viscosities - this allows you to remove deposits in transmission parts. For manual transmission models, Castrol Syntrax Universal Plus 75w90 multipurpose synthetic oil is often used.

Castrol 75w90 oil has excellent synchronizing properties; it is used in mechanical and axle gearboxes.

When using this transmission fluid, several more of its advantages were revealed:

Helps save fuel, and hence the budget.
Resistant to low and high temperatures, which allows it to be used in different climatic zones.
Shifting gears is effortless and effortless, making for a more comfortable driving experience.
Protects against the occurrence of soot.

Castrol products with a wide range of advantages speaks of how important its quality is for the manufacturer. Castrol oils are used and recommended by automakers such as Jaguar, BMW, Volvo, Lamborghini and Mitsubishi.

Video: Castrol oil review

Sooner or later, every motorist is faced with the need to change the transmission fluid. The variety of materials on the market can confuse even an experienced motorist. We invite you to familiarize yourself with the rating of popular fluids and find out what the transmission oil of Castrol, Total, Motul, Hado, Rosneft, Mannol and other manufacturers is.

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Differences in transmission fluids

This is of interest to many modern motorists. First of all, the characteristics from different manufacturers are the main difference. Different manufacturers use different composition components in the basis of their products. Sometimes these elements may be incompatible with each other.

Second, purpose. Products from different manufacturers, having certain characteristics, may be intended for certain types of cars. It also plays an important role. Another point is additives. Each manufacturer uses its own additive package in its products. In addition, according to their composition, oils from different manufacturers and their intended purpose can be used in automatic or. But there are no universal products that can be used both in mechanics and in an automatic machine.

You can find out the necessary information about gear oils from the video (author - avtozvuk.ua).

Characteristics of the best brands

Castrol

Let's start with the Castrol brand. Castrol 75w90 products are mineral, synthetic or semi-synthetic consumables. Castrol 75w90 has high extreme pressure properties compared to other gear oils (TM). The purpose of Castrol 75w90 is to operate in manual transmissions and units with a drive axle.

According to the manufacturer, Castrol 75w90 oils perfectly protect the gearbox during a cold start of the internal combustion engine. In addition, Castrol 75w90 has low temperature fluidity. The main advantages of Castrol 75w90 include good synchronizing characteristics, lubricating properties, as well as Castrol's resistance to cold. The only but significant drawback of Castrol 75w90 is its high cost.

TNK

TNK gear oil is a top-class consumable for cars and trucks. As expert reviews show, in fact, TNK well protects the transmission systems of machines from increased wear, as well as rust formation. The product manufacturer claims that the lubricant will work fine in -35 degrees frost, but this is not always the case. But we hasten to assure you that at -35 a car at TNK usually starts up without problems.

Another advantage is availability - the cost of goods is much lower compared to other manufacturers. However, experts do not recommend pouring this lubricant into systems with synchronizers made of non-ferrous metals, since the liquid can lead to their destruction over time.

Elf

Elf gear oil is perfect for those vehicles whose drivers like to pretty much exploit the gearbox. In this case, Elf will be the best option, in particular, we are talking about the 75w80 brand. This semi-synthetic consumable has excellent extreme pressure properties. Due to the thermal stability index in severe frosts, the lubricant does not thicken so quickly and not so critically, and in the heat and when heated it does not become completely liquid.

Such a product is recommended by the French manufacturer Renault for use in gearbox types J, TL4, NDX. Thanks to the additive package used, the lubricant can reliably protect gear teeth even under extreme loads. The oil also has a good viscosity index and oxidation resistance. A significant disadvantage is the high price.

Total

Consumable synthetic product Total 75w90 is universal and, according to the results of independent studies, was even called the best. Total has good thermal stability, as a result of which, up to 50 degrees below zero, the lubricant should not thicken. At critically high temperatures, Total does not become liquid. Thanks to the addition of high-quality anti-corrosion and anti-wear additives, Total helps protect the gearbox from wear and rust.

In practice, the service life of Total is quite long, much longer than that of other lubricants, respectively, it will need to be changed less often. In addition to the main advantages, Total is compatible with many types of synchronizers. Also, the advantage of Total is low loss of viscosity characteristics during shear. The main disadvantage of Total is its versatility. As reviews show, because of this, Total fluid is not suitable for all gearboxes.

Motul

Motul was created specifically for transmissions with difficult gear changes. These include almost all manual transmissions, and if necessary, you can find Motul for automatics. According to the manufacturer Motul, then all the lubricating characteristics of the consumable are brought to the maximum level so that Motul oil can reduce the friction of the elements. As testimonials from various consumers show, Motul really makes it easier to switch gears.

Thanks to its low temperature characteristics, when using Motul, the gearshift lever will shift without problems even in severe frost. In practice, in some cases, Motul allows you to reduce the level of vibration and noise during the operation of the unit. In addition, Motul is compatible with all non-ferrous metals and elastic elements, so you don’t have to worry about their destruction. The disadvantage of Motul is a rather high price, which is not acceptable for all consumers.

hado

As for the Hado product, according to the manufacturer, a specialized package of additives with an anti-seize complex is used in the production. Thanks to this Hado composition, gearbox wear is reduced. Hado consumables comply with all international world standards and are approved for use in many modern cars.

The benefits of Hado are as follows:

oil allows for convenient switching of speed modes due to good synchronization of transmission gears;
Xado can be used in gearboxes equipped with self-locking differentials;
Hado is resistant to aging and oxidation processes, which significantly increases the service life of the product;
due to its flow characteristics, the use of Hado is relevant in regions with cold winters; this oil is able to work normally at temperatures up to 40 degrees below zero.

The main disadvantage, as in previous cases, is the high price.

Rosneft

Rosneft offers consumers a choice of semi-synthetic or mineral transmission fluid. Rosneft grease is produced using multicomponent additives from popular world brands. The main purpose of Rosneft is the lubrication of heavily loaded manual transmissions, in this case the type of gear does not matter. Rosneft can be used both in mechanical boxes of passenger cars and trucks.

According to the manufacturer, Rosneft meets the requirements of world standards. The use of Rosneft is possible in any region, the temperature range of the substance is from -40 to +40 degrees.

The main advantages of Rosneft are listed below:

reliable protection of the unit mechanisms when operating in a wide range of loads and speeds;
Rosneft reliably protects the gearbox components from wear.

Mannol

Mannol has been in the business of transmission consumables for a long time. The choice of the consumer is offered synthetic, semi-synthetic and mineral fluids Mannol, which have different characteristics and parameters. According to the manufacturer, Mannol production technology is regularly upgraded, which allows to constantly improve the properties of the product.

Mannol oils have good performance properties, this is also confirmed by the reviews of some consumers. Additives are added to Mannol to improve the performance of the product. In particular, Mannol excels at both low and high temperatures. Detergent additives allow you to effectively remove all deposits and dirt from the system when changing the material.

Ravenol

Ravenol gear oil is a premium quality universal fluid produced in Germany. Ravenol is based on hydrocracking oil, to which polyalphaolefins are also added. Additional additives allow you to reliably protect the unit from heavy loads.

As a result of the addition of a synthetic base, Ravenol works well in low temperature conditions. Thermal stability characteristics allow you to increase the replacement interval of the substance. In some cases, Ravenol allows you to get rid of extraneous noise that occurs during the operation of the transmission.

Liquid Moli

The last product on the list of the best gear oils is Liquid Moli. The versatility of a lubricant of the TDL type - Total Drive Line - allows the use of TM in vehicles with any type of drive. It can be used in both synchronized and non-synchronized units, as well as gearboxes with hypoid gearing. Liquid Moli, like most other oils described, has excellent anti-wear and anti-friction properties.

Can gear oils be mixed?

Can gear oils be mixed? This question is of interest to many consumers. The main requirement in this case is the compatibility of the compositions of the mixing fluids, and most importantly, the additives. If the additives of the miscible materials are incompatible, a chemical reaction may result in the destruction of some of the internal components of the transmission. In general, when answering the question of whether it is possible to mix gear oils, experts do not recommend doing this, because the liquid may lose its properties, and there will be no sense in using it.

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Video "How to change the oil in the gearbox"

More information about the process of changing gear oil is on the video (the author is in Sandro's garage).

Reading 4 min.

On the shelves of shops you can find a great variety of different oils for mechanics. The price of various options can vary from $2.5 to $25 per liter. But how do you choose the perfect one? To do this, you need to ask the seller one question: what gearbox oil has excellent extreme pressure properties and is absolutely safe for synchronizers? The answer is simple: it's Castrol Syntrans Transaxle 75w 90.

Oil Description

Castrol Syntrans Transaxle 75w90 (previously called Castrol TAF X 75w90) is a 100% synthetic transmission. A distinctive feature of gear oil is enhanced anti-wear performance in comparison with other products of this class.

The synthetic base used to create this manual transmission oil makes it resistant to freezing temperatures and guarantees exceptional low temperature fluidity.

The lubricant has excellent stability under extreme loads. The product actively fights against wear of parts, while remaining absolutely safe for synchronizers. Even under severe operating conditions, the lubricant exhibits excellent synchronizing properties. Castrol Syntrans Transaxle guarantees exceptionally smooth shifting and fast gearbox response.

The oil has excellent resistance to high temperatures. With Castrol Syntrans Transaxle 75w90, all transmission parts will be kept perfectly clean, extending the life of the transmission for many years to come.

Specifications

Index	Unit	Meaning	Check method
1. Viscosity characteristics
Kinematic viscosity at 100°C	mm2/s	14.8	ASTM D445
Kinematic viscosity at 40°C	mm2/s	78	ASTM D445
Viscosity index		195	ISO 2909
Brookfield viscosity at -40°C	mPa*s (cP)		DIN 51398
Density at 15°C	g/ml	0.866	DIN EN ISO 12185
2. Temperature characteristics
pour point	°C	-54	ISO 3016
Flash point, SOS	°C	210	DIN ISO 2592

Application area

Canister 20 liters

Castrol Syntrans 75w 90 is designed to be filled into gearboxes located in the final drive unit, as well as for the front drive axle, final drive and manual transmission. In addition, the product can be used in transfer cases where the use of this class of technical fluid is assigned.

The oil in the 75w90 Castrol gearbox has been approved by the Volkswagen auto concern, which indicates its quality level and excellent performance properties. The VW Group approval indicates that the oil is also approved for use in Audi, Skoda and Seat. Also, this product can be poured into an Audi transmission with a longitudinal engine configuration.

Specifications

API GL-4+;
VW 501.50.

How 75w90 stands for

Castrol Syntrans 75w90 oil can be used in gearboxes in both summer and winter. Its viscosity of 75w90 regulates the temperature range at which the lubricant retains its properties. In this case, these are temperatures from -40 0 С to + 35 0 С.

Advantages and disadvantages

Like any other synthetic for a German brand manual transmission, the main drawback of Castrol Sintrans 75w 90 is the price. It will be slightly higher than the average price level for similar products. However, after reviewing the list of advantages, it comes to the understanding that a good product cannot be cheap.

Reliably protects all parts of the transmission.
It has an extensive package of extreme pressure additives.
It has excellent synchronizing properties.
Absolutely safe for any type of synchronizers.
Extends transmission life.
Provides smooth shifting.
Does not freeze at low temperatures.
Saves fuel.
Leaves no deposits on transmission parts.

Separately, it should be noted the ergonomic shape of the package, which makes filling oil into the crankcase an extremely simple process.

Forms of release and articles

1557C3 - Castrol Syntrans Transaxle 75w-90 1l;
1557C5 - Castrol Syntrans Transaxle 75w-90 20l;
1557C4 - Castrol Syntrans Transaxle 75w-90 60hp

How to distinguish a fake

Information on the back

When buying transmission oil, you should remain vigilant, otherwise there is a risk of not only overpaying for a low-quality product, but also causing damage to your car.

The counterfeit Castrol 75w90 gl 4 canister can be distinguished by several features:

the canister is dirty, with traces of oil smudges;
on the canister there are traces of soldering, adhesive sealant;
there are traces of opening on the canister;
the color or shade of the canister is different from those presented on the official sites;
there is no release date and batch number on the canister;
there is no seal on the canister;
there are holes in the corners of the canister;
the density of the plastic from which the packaging is made is different in different parts of the canister;
There is no manufacturer's seal on the cover and on the protective ring.

Video

Castrol Syntrans Transaxle 75W-90 1L

Transfer boxes and drive axles are called transmission. Transmission and engine oils have a similar classification. For TM, the main properties are: viscosity characteristics, operational and anti-corrosion properties, as well as lubricity and thermal-oxidative ability.

Gear Oil Overview 75W-90

Transmission oil, as well as engine oil, has its own, which you also need to be able to correctly decipher. On the oil label there is an SAE classification And API, some have ZF classifier or MIL specification, and can also be approvals of individual car manufacturers.

All modern gear oils must comply with the classification according to the international standard SAE J306. 75w90 is the most commonly used viscosity grade among transmission fluids.

The value of the viscosity characteristics of 75w and 90

According to SAE, TMs are divided into types and, accordingly, their purpose depending on viscosity. Since we will be talking about 75W-90 gear oil, we will deal first of all with its characteristics.

75W- this indicator is known as "winter", shows the degree of fluidity at low temperatures. The lower the value before the letter "w", the more fluid the transmission is in the cold. For this type of oil, the threshold should be at -40 °C.

The second indicator of the viscosity range is 90 , it is also called "summer", indicates the maximum tolerated positive temperature of the outside air at a temperature of 100 degrees Celsius. The parameter itself also does not reflect the true value, you just need to know that, according to reference data, this threshold will be up to +35 ° С.

It would seem that why 75W90 oil is the most acceptable for our latitudes, why not create a universal one with an even wider temperature spectrum? But not everything is so simple. The friction protection between gear surfaces is directly related to the lubricity of the gear oil. Although this indicator improves significantly with an increase in viscosity, the law of resistance comes into force, transmission power losses increase, due to the energy spent on squeezing it out from under the gear teeth. And yet, viscous oil is very thick in the cold. Less viscous, at sub-zero temperatures, feels good, but has a less durable protective film and worse lubricity. To balance these two indicators, special additive packages are also used.

In the zone of moderate temperatures, it is better to focus on the viscosity class "90", but "140", that is, TM, the viscosity of which at 100 ° C is not lower than 24 mm2 / s, may be preferable for a hot southern climate or heavy loads at high speeds .

The transmission fluid must perform the following functions:

eliminate friction, seizing, scuffing, pitting (deep corrosion of metal) and other damage;
reduce energy loss and increase efficiency;
remove heat from friction surfaces;
reduce noise and vibration during gear operation.

Therefore, TM 75W90 from different manufacturers, of course, is somewhat different in its properties, and, of course, in its price tag. In addition, 75W90 gear oil is often synthetic, although in some cases, a number of manufacturers may indicate on its label as semi-synthetic. But in fact, it differs from synthetics only in the content of a synthetic substance of 20% - 40% and the amount of additive from 2 to 15%.

In addition to the fact that these fluids are classified according to the SAE system, there is a division of gear oils according to the API system with the "GL" index (in the Russian version - the "TM" index).

Operational properties of TM

API Classification Shows Comprehensive Score transmissions depending on the performance properties and is divided into six categories. Categories are marked with an index, which makes it possible to understand the scope and quality level of the product. In the transmission of passenger cars, today, only two groups of fluids are used - GL-4 and GL-5 (TM-4, TM-5 according to the domestic classification).

GL-4(or TM-4) - designed for medium loaded gears. It is used in manual transmissions and mechanisms with spiral bevel gears. The operation of such oils can be carried out in hypoid-type transmissions at high speeds, but low or moderate torques.

GL-5(or TM-5) - used for heavily loaded gears. The operation of an oil with this standard is carried out in hypoid gears at low torques in combination with high speeds, subjected to short-term shock loading. This oil contains a large amount of a sulfur-phosphorus-containing extreme pressure additive.

Also a very common 75W90 oil marked - GL-4/5, the presence of two indices indicates the use in different load conditions and different types of mechanisms.

MIL specification

In addition to API classification, it is often used US MIL specification. For 75W90, this is MIL-L 2105 A, B, or C. Confirms compliance with the specifications of all-season gear oils, analogous to API GL-4 or GL-5.

ZF gear oil quality classifier

Also on the 75W-90 oil canister you can see Z classifier, - This classification system for all types of motor vehicle transmissions. Designation is made by letters and numbers from ZF TE-ML 01 to ZF TE-ML 14.

What is the difference between GL-4 oils and GL-5 75W-90 oils?

As already mentioned a little higher, the appointment of TM oils GL-4(according to GOST 17479.2–85) - for operation in transmissions with bevel and hypoid gears operating at contact stresses up to 3000 MPa and oil temperatures up to 150 °C. By and large, these are front-wheel drive gearboxes. API GL-5 - ensures reliable operation of the hypoid gear operating with shock loads at stresses above 3000 MPa. It is used in gearboxes with hypoid bevel gears and for final drive with cardan drive in drive axles (with limited slip differential LSD). This transmission fluid provides better protection under high loads and pressures.

Mistakes when choosing TM 75W90 and the difference between GL 4 and GL 5.

Key Feature is that in 75W90 API GL-4 oils, there are two times less sulfur-phosphorus additives than in similar ones, only a class higher. These additives create a special protective coating on parts that prevents wear, but this substance is even stronger than the surface of parts made of copper or other soft alloys. Therefore, the use of TM for other purposes threatens to wear out the surface of an element made of soft metal. So, in those gearboxes where you need to use 75W90 GL-4, and GL-5 is poured, there is a rapid appearance of copper chips, since the synchronizers are made of copper, and the sulfur-phosphorus additive kills them.

The transition from GL-4 to GL-5 and vice versa is unacceptable: these are different oils with different properties and purposes.

Rating of the best gear oils with a viscosity of 75W90

Viscosity. The oil must maintain optimal viscosity both at low temperatures and retain its astringent properties at high temperatures;
Temperature characteristics. Each liquid has its own pour point and ignition temperature, TM should have the largest gap between these indicators;
Badass Index. Unfortunately, there are no norms for this index, but the higher this value, the better the TM;
Wear rate. Such a criterion is determined only for class GL-5 oil, it must be less than 0.4 mm.

The TOP of the best gear oils does not take into account their cost, but is based on reviews and comparative tests.

Transmission oil in many respects Motul Gear 300 75W90 takes first place among all subjects. This transmission has the highest rates of scuffing protection (the index is 60.1), welding, oil film stability without loss of engine power, and an average wear rate (0.75 mm). Although it cannot boast of viscosity characteristics (especially at sub-zero temperatures).

Temperature test for 75W90 gear oils

Second and third places are occupied by transmission fluids from Castrol (Syntrans) and Mobil (Mobilube). Oil Castrol Syntrans Transaxle 75W-90 GL-4 is used in gearboxes, transfer cases and drive axles. It has good low temperature fluidity, but compared to Mobile, the scuff index is quite high, as for a fluid of this class, but the wear level is even better than that of Motul (59.4).

TM Mobil Mobilube can be put in third place, as it has good results in tests for the level of protection and wear under high loads, therefore, provides low friction losses at operating temperatures. But, unfortunately, it has an insufficient viscosity index at sub-zero temperatures.

The fourth result when testing gear oil showed oil total transmission SYN FE 75W-90. Reviews about this fluid are also good, although since it is universal - it has API GL-4 / GL-5, it will not be suitable for all gearboxes. This TM has a scuff level of 58.8, which is even better than that of the leader in the rating of gear oils 75W90. But it does not boast a level of wear and good viscosity in a low temperature test.

Semi-synthetic gear oil LIQUI MOLY Hypoid-Getriebeoil TDL 75W-90 GL-4/5 also shows itself well in tests, it especially stood out when tested at minus 40, its fluidity at such a low temperature will allow the gearbox and gearboxes to work without problems. However, other important indicators are at the average level.

synthetic oil ZIC G-F TOP We do not include 75W-90 in this rating, since there is very little data on its wear and tear indicators, although the temperature test passes perfectly. This gear oil can be used in manual transmissions (including those with synchronized transmissions) and drive axles. According to car owners, it significantly reduces transmission noise, withstands extreme loads and has practically no drawbacks.

Also, one cannot but pay attention to the Transyn 75W-90 API GL 3/4/5 oil from the manufacturer Eurol, because, looking at the lack of real temperature tests and a very high level of wear - 0.94, it has a good scuff level - 58.5 and is very popular among car enthusiasts.

As you can see, the range of 75W90 gear oils on the market is quite large and there is always something to choose from for your needs and an affordable price. But remember that you need to select not because your neighbor advised, but based on the needs of your car's transmission and the characteristics of the transmission fluid itself.