The way the drug enters the human body is of great importance for the treatment of many diseases. In particular, for some pathologies of the reproductive system in women, vaginal suppositories are used, which should be inserted directly into the vagina. The medicinal substance contained in them can be absorbed into the blood, acting from there, or else have an effect directly in the vagina, destroying the dangerous flora. There are forms of candles that are used as contraceptive drugs.
This type of local therapy is used mainly for the treatment of inflammatory processes in the female reproductive system. Vaginal suppositories contain a certain dose of therapeutic active substance, which enters the bloodstream by absorption.
That is why, before using them, you should visit a doctor who, according to the established diagnosis, will prescribe the correct doses and duration of the course of treatment.
In addition, some women may have hypersensitivity to both the drug contained in the suppository and the components that make up its basis, which is why these drugs should not be used without first consulting a doctor.
The main indications for the use of vaginal suppositories:
- Prevention of various sexually transmitted infections (gonorrhea, pale treponema, chlamydia, trichomonas, ureaplasmas);
- Prevention of infectious complications after any invasive manipulations on the organs of the female reproductive system;
- Local therapy for various options inflammation of the vagina and cervix;
- Erosive lesions of the cervix;
- As a means of contraception.
Vaginal suppositories are made in such a way that during external environment they are in a solid state, and when they enter the human body, they dissolve. Because of this, for many girls using these funds, the question is whether vaginal suppositories flow.
The basis for the drug is cocoa butter or its various alloys with other fats. The composition of the suppository also includes a gelatin-glycerin base and the medicinal substance itself. The shape of the drug can be ovoid, spherical or flat with rounded ends.
As for contraceptives, their action is to destroy spermatozoa that enter the vagina. Vaginal suppositories should be administered in a quarter of an hour before intercourse or a little earlier. When using such suppositories, you should also consult a doctor, as the contraceptive has many side effects and contraindications.
Each type of vaginal suppository comes with a corresponding instruction, which should be carefully studied and followed by the rules indicated there. There are preparations that must be soaked before use. Moreover, if this is not done, then the entire therapeutic effect of the medicine will disappear - the candle simply will not dissolve in the vagina and will fall out. Another rule that is relevant for those who do not know why vaginal suppositories leak out is that they should be used before going to bed in order to be in a horizontal position for as long as possible. In order to prevent leakage, the girl should lie on the bed on her back with her legs wide apart, bent at the knees. The drug is injected with a finger into the vagina as deep as possible, otherwise there will be no effect, and the candle may fall out.
Some of the vaginal suppositories designed to treat inflammatory processes work on a different principle. Such vaginal suppositories leak because it is provided for in the manufacture. The drug is not absorbed into the blood, but dissolving inside the vagina, it destroys pathogens in it, after which it is poured back.
There are several general rules for using vaginal suppositories:
- Immediately before the introduction of the drug, a woman should conduct a thorough toilet of the intimate area. IN this case douches are welcome, although their use must be very careful due to a number of side effects.
- Hands when inserting a vaginal suppository should be as clean as possible, since re-infection of the vagina is possible.
- All hygiene procedures after the introduction of the suppository should not be carried out, as this will minimize the therapeutic effect of the drug.
- Special conditions are required for storing vaginal suppositories so that they do not melt and lose their shape. A certain storage temperature is required for candles. In addition, with a long stay in the hands of a person, the candle also melts, since the basis of its action is dissolution when body temperature is reached. When removing the suppository from the package, it should be immediately inserted into the vagina.
- If the doctor has prescribed the use of anti-inflammatory suppositories several times a day, the use of sanitary napkins is recommended, as the amount of discharge will increase. In this case, no additional hygiene procedures are required after using the candle. Change pads as often as possible to achieve maximum asepsis in the intimate area.
- For the period of treatment it is necessary restrict sex life to prevent the spread of infection and additional infection. Against the background of regular sex, the therapeutic effect of candles will be minimal or absent altogether.
It is unacceptable to use vaginal suppositories without first consulting a doctor. Self-medication can aggravate the disease, because of which it is necessary to use not only local, but also systemic therapy.
In addition, all diseases of the reproductive system are dangerous for their complications, in particular, infertility, so visiting a specialist is a paramount task if any problems are found in this area.
A spark plug is a seemingly simple detail, but mistakes in choosing it can lead to extremely unpleasant consequences.
So it's time to change the spark plugs. The simplest way avoid mistakes when choosing - buy exactly the same. taking with him as a sample native. But if you can’t find them and you have to buy others. what to pay attention to first of all? The most annoying thing is to buy candles with an unsuitable threaded part or a different turnkey size. Do not try to replace a plug with a mechanical seal with another one with a conical seal, or vice versa. These "little things" greatly affect the efficiency of the candles and their cooling.
The spark plug works on the border of relatively cold parts of the engine and the flame of the combustion chamber with temperatures up to 2500-3000 °C. From how far the candle electrodes protrude into the chamber. depends not only on the success of ignition working mixture, but also the risk of overheating, so the design must provide sufficient heat dissipation - the transfer of the maximum heat received to the block head and beyond.
The working conditions of the candle are extremely contradictory. Although the coolant temperature is close to 100 ° C. some parts of the engine are much hotter. The hot part of the candle is especially hot. The thermal cone (skirt) of the insulator and the electrodes can heat up to 900 °C. So, how much heat a candle receives and how much it gives off in a given mode depends on its design and materials. A long skirt, under the same conditions, heats up more than a short one. The first candle is called hot, the second - cold. The main heater of the candle is the central electrode. Modern - as a rule, bimetallic. For example, the core is copper (for good heat dissipation), and the shell is made of fire-resistant nickel. There are central electrodes based on silver. platinum. In the steady state of the engine, the heat received by the spark plug from the combustion chamber must be removed by the cooling system and partly by the fresh working mixture. Alas. this does not always work.
A minimum of heat is generated in the cylinders at low fuel consumption - at Idling. It is important here that the thermal cone of the candle does not cool below the minimum self-cleaning temperature (about 500 ° C). In this case, the layers on it completely burn out and the spark formation is not interrupted. If. turning the candle out, we see black soot - it is too cold. When the engine is running at low loads, this will soon fail.
When working on full power tougher tasks. Skirt and electrode temperatures not exceeding 900 °C are considered acceptable. Otherwise, corrosion of the electrodes is accelerated. And at about 1100 ° C, the infamous glow ignition is possible. This is premature. without the participation of a spark, ignition of the mixture from contact with hot parts of the combustion chamber, including an overheated spark plug skirt and electrodes. The effect is insidious: the driver high speed may not understand that the electrodes of the candles have already burned out and the motor sings without the participation of electricians. The glow plug is out of control. There are no misfires. The ECU will not turn off the injectors. If detonation occurs, reducing the SV will not help. Such races often end with the destruction of the pistons, jamming, etc. So, if the temperature of the hot part of the candle reaches 1,000 ° C or more, then for this engine she is too hot.
The stock spark plug in the engine is neither hot nor cold. She is normal. The engine designer took care of that. For example. A17DVRM spark plugs work perfectly in the engine of an ordinary Samara, while in a racing one they will overheat. provoking a fire. And in normal operation, racing candles are inappropriate - they will overgrow with soot and refuse.
To make it easier for us to choose, manufacturers label products: As a rule, the same candle is suitable for cars different brands and models, but not all. Firms indicate conditional heat numbers, but there is still no uniformity in this. Knowledgeable salespeople will take a look at comparison tables. But it is also useful for buyers to have at least a little knowledge of the topic. Eg: suitable candles purchased, but the gaps between their electrodes do not meet the requirements of the engine. How to proceed?
It is known: with an increase in the gap, the mixture lights up better. But you can not increase it too much - the spark will disappear. The allowable gap depends on the energy capabilities of the ignition system, cylinder pressure, mixture composition, temperature at the end of the compression stroke, etc. weak systems(like "Zhiguli") a gap of about 0.6 mm is recommended. (But when the gap is less than 0.A mm, the ignition of the mixture slows down so much that interruptions in the operation of the engine may occur.) modern candles with a gap of about 1 mm. it for machines of older models, most likely, will have to be reduced.
Modern powerful ignition systems pierce 1-1.2 mm and even more. But at long service the electrodes wear out a lot, the gaps grow. sparking is broken. If the ECU notices that there are too many misfires, the self-diagnosis will turn off the injector faulty cylinder and turn on the "check engine" light. Excess fuel will not burn in the converter and destroy it.
But cars without self-diagnosis sometimes present real riddles. Once a guy came to me on the "nine": "When accelerating, the motor twitches!". The most common cause this - the gaps are too big, the coil voltage for breakdown is not enough, and for high speed it falls. Finally, the more the throttle is open, the higher the pressure of the mixture - it is more difficult for a spark to break through it. They turned out the candles, and there were gaps of two millimeters each. For the sake of science, I reduced them to 0.7-0.8 mm, screwed them back. And the engine worked great! We are candles. of course they replaced it.
Another example. The caring owner of Logan traveled little in winter. but the engine now and then started up for a minute. Why "" And so that the battery does not sit down!" As a result, the candles, without leaving the operating mode, were sooty. began to work intermittently ... We reduced the gaps - and the motor worked steadily. I foresee the question: will the reduction in clearances affect power and fuel consumption? Theoretically, of course1 But not everyone will notice a loss of even 5-6 percent of power, and in comparison with the failure of at least one cylinder, these losses are negligible. And when the candles are cleared, you can return the gaps to normal.
From correct operation spark plugs depend on many parameters of gasoline engines.
Serviceability control and their timely replacement is a condition correct operation vehicle.
Causes of their natural and premature wear
The spark plug works to the limit extreme conditions:
- high temperature in the working cylinder;
- aggressive environment in the form of a mixture of fuel, air and oil;
- high pressure during ignition;
- high voltage and temperature of electric spark.
The simultaneous action of these factors leads to an increase in the processes of their natural wear. This process can be greatly accelerated in the following cases:
- reduced compression, wear valve stem seals due to oil entering the working volume;
- incorrect installation of the ignition angle, leading to the formation of increased soot;
- selection of candles that do not correspond to the brand of the engine;
- misfiring in cylinders;
- incorrect ratio of gasoline / air in case of malfunctions of the flow meter, air leakage;
- incorrect operation of the injectors.
Signs that you need to replace them
The main sign of the need to replace candles is misfiring (triple). This is not always due to problems with candles. In order to finally decide on the need for their mandatory replacement, the easiest way is to install a known-good one instead of a problematic candle.
It is easiest to determine a possibly faulty spark plug with the engine running. To do this, you need to turn off high voltage wires(or a connector for an individual ignition coil) from each of them. The non-working cylinder will be the one, when disconnected from which the nature of the engine operation does not change.
Also signs of the required replacement of spark plugs are:
- visual malfunction (contamination, carbon deposits in the gap area, change is normal gray color soot, its moistening, mechanical chips on the insulator);
- unstable engine speed;
- increased opacity of exhaust gases;
- engine detonation;
- message or on-board computer.
How often should spark plugs be changed
Each manufacturer indicates the period or mileage uptime candles. This period is calculated for engines with a service life of not more than five years. If the car is equipped with an older engine, the service life (mileage) of the spark plugs is reduced.
There is no clear gradation of mileage and terms for replacing spark plugs. Experienced motorists consider it right to produce technical inspection and their replacement before the start of each autumn-winter season of operation. If the car is not operated in the cold season, it is rational to control and necessary replacement produce in the spring.
Video - when to change spark plugs and why it is important:
Guided by the indications of the car's mileage, the replacement of spark plugs should be done after 15 - 20 thousand kilometers. iridium and platinum candles easily withstand a run of 100,000 km or more, but this is also with a relatively new engine.
Engines internal combustion gas-powered have elevated temperature combustion fuel-air mixture, their service life should be reduced by 20-30%. Another factor in a similar reduction in the replacement of spark plugs is the use of low-quality gasoline.
Their extraordinary replacement is carried out after a major and large emergency repair, long-term parking car.
Replacement sequence
Despite the apparent simplicity, this operation should be taken responsibly. Replacement should be made complete set (!) . Partial replacement one or two "walking" candles is possible only for a short time.
A different gap and type of candles, their condition leads to an indispensable failure of the ignition timing, increased detonation, contributes to increased wear engine.
Based on reference data. Don't rely on "these are the best" recommendations. It is better to purchase products only from trusted manufacturers.
As the main tool for replacing candles, it is better to use a special long head with rubber inserts to grip the candle being removed. Before buying it, you should measure the diameter of the landing design hole.
The standard sizes of candle heads are 16 and 21. The length of the landing zone can be different, up to 180 millimeters in individual models engines. In some cases, a candle tube can be used, but it should be borne in mind that its reliability is less. It's even worse to use special keys unknown manufacturers in beautiful packaging. They can break at the first unscrewing.
The sequence of dismantling candles:
- remove the installed high-voltage wires, having previously noted or photographed the sequence of their installation;
- if the car has individual ignition coils or a block of coils in the near-candle space, dismantle them (in V-shaped engines, this process can be complicated by the need to dismantle the part intake manifold and other elements of the engine);
- be sure to check the installation areas of the candles for the presence of foreign objects (when removing the candle, fragments of insulation, other objects can fall directly into the cylinder, cause big problems);
- securely install the candle key, applying medium force, proceed to unscrewing;
- in case of difficulty in the dismantling process, it is necessary to use special means for decoking threaded connections, do not try to apply excessive force;
- remove the candle (if the holding gum has come off, you can do this using the tip of the high-voltage wire);
- it is better to install a plug or throw a clean rag on the vacated hole of the candle (there are many cases when, during the repair process, nuts, washers and other “surprises” get there, that is, into the cylinder).
Video - replacing spark plugs with Renault Logan and Largus (8 valves):
The installation of new ones is carried out, guided by the rules:
- with a clean rag, clean the installation site from oils, dirt (if this place is not available for visual inspection, it is better not to do this: trying to remove contamination from the top of the threaded connection, you can redirect it to the thread);
- when installing new ones, it is necessary to check once again that the seating depth of the candle matches the old one;
- initial direction of the candle seat they are done carefully with a candle wrench, you should not “throw” the candle, this can change the gap;
- pre-twisting should be done with a little effort; if movement is difficult, it is necessary to unscrew and start twisting the candle again;
- the final “squeezing” of the candle is carried out with an average effort (at the service station, they use torque wrench, the tightening torque is set in the range from 15 to 35 Nm, depending on the thread diameter and the type of fit);
- the last step in the installation of candles - installation high voltage wires.
Why change spark plugs if the old ones work?
Theoretically, they can last ten years or more, especially if they are periodically cleaned.
There is an opinion that spark plugs should be changed only when obvious signs their wear, carrying out repairs related to ignition problems and the engine as a whole. However, old, albeit serviceable, spark plugs can adversely affect engine performance:
- changing the gap area affects the ignition timing;
- minor misfires lead to increased detonation, mechanical stress;
- dirty candles can cause a breakdown of the ignition coil, high-voltage wires, runner resistor;
- incorrectly working candles affect the environmental performance of the internal combustion engine.
The most dangerous problem with rare spark plug changes is coking of the threaded connection area.. This is fraught with the possibility of thread breakage, damage to the candle during dismantling. In turn, such a malfunction may lead to the need for overhaul, even replacing the cylinder block.
That's why experienced car enthusiasts before the next autumn-spring season of car operation, their preventive dismantling and assembly are carried out. At the same time, it is possible (and necessary) to make a visual inspection of them.
Serviceable and serviced spark plugs are one of the main factors stable operation gasoline engine.
Video - spark plug wear and when to change them:
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Comments on the article:
Egor
The main sign that makes you pay attention to candles is, of course, "triple" when the engine is running. Sometimes it helps to flush the spark plug, remove carbon deposits and check the gap, or replace the spark plug with a spark plug of the same model.
Sergey Vasilevich
The main rule - do not pour any rubbish into the gas tank and everything will be in order with candles. In general, everything is fine in the article. And more, if new car you should not bother with candles at all, even if this is our auto industry.
Sergey
Candles changed a year ago, this decided to visually assess their condition. It turned out to be normal, only the reddish coating and soot were embarrassing. Surprisingly, the candles were perfectly washed with a rust cleaner (I was still working on thresholds that day). After soaking in a cleaner, with a brush and a rag, he removed all the plaque, they shone almost like new ones. Washed in water and dried. I checked the clearance before installation and it was within the normal range. Now they work great.
Michael
I check the condition of the candles every six months or every 10 thousand kilometers (whichever comes first). Usually high-quality candles are easily nursed for 50 thousand km. When checking, be sure to bend the electrodes of the mass by putting a probe 0.8 mm thick in the gap. Usually, over 10 thousand km, the electrodes burn out by one or two tenths of a millimeter, so I consider gap adjustment to be mandatory.
It is also necessary to clean the insulator from soot - either by sandblasting, or at least mechanically picking it up (carefully), since soot is a conductor, and with its large thickness, instead of a spark between the electrodes, it will be short circuit through soot and we'll get misfiring.
Anatoly
On Toyota engine you can't get close to the candles and it's difficult to check them yourself. And the master in the car service says that it’s not because of the troit ...
Vyacheslav
Now they sell such candles that even 10,000 do not pass (you have to make a replacement). Only the factory ones could serve me for 3 years (51 thousand mileage).
Andrey
If the car engine is new or after a major overhaul and runs smoothly without strain, then for a while you can forget about candles. Unless, as the author of the article objectively recommends, do not forget about threaded connection. Another thing is when the engine "eats" oil. There carving will not rust. You will need to remove the candles often for cleaning and drying. About a couple of times a month and always have in stock new kit candles.
Alexei
I also have candles for the third year. I can definitely say that you need to choose them carefully. On the market, I would not advise taking them, it is better - in trusted stores.
Ivan Kozin
I am very attentive to the issue of choosing candles, high-quality and reliable immediately remove a bunch of questions.
Oleg
I always change spark plugs before winter to start normally in cold weather. The car is already 10 years old, there were no problems. It’s better to change a small thing than to hit a big one later.
Sergey
You buy cheap candles - for a maximum of a month, you buy expensive ones - for a maximum of a year. With this market, damn it, everything will soon work strictly until the end of the warranty period.
Andrey
Most often, spark plugs fail due to incorrect operation fuel system. That's why I rarely change spark plugs.
Vadim
I change candles strictly according to the regulations: after 15,00 km of run or one year after installation. Never failed.
Oleg
In order not to be standing in the middle of the road, of course, you need to know the signs of candle failure and how to replace them. Earlier on Soviet cars when there was practically no electronics in them, they took out a candle and looked to see if there was a spark on it when the engine was running. Now on modern machines, this is extremely dangerous, you can disable the ignition module, switch, burn the coil. Therefore, I do not recommend using old-fashioned methods. It is best to go to the service computer diagnostics. True, if you know your car and it is not too fancy, you can remove the wires from the spark plugs one by one and listen to how the engine behaves. If you turn off a working candle, then its nature of work will change, as the specialists say, “it will start to triple”, in Russian the engine will shake violently. If nothing changes, we change the candle, it is junk. If nothing changes again, then the direct road to the service. And do not buy candles one at a time - change the set. When buying candles, be sure to take a vehicle registration certificate (there is a VIN number there) so that the seller finds in the catalog the right candles. And it is necessary to think about replacing them when: the engine “zatroil”, power dropped and fuel consumption increased.
Karpukhin Vitya
I think the spark plugs should be changed at every oil change. After all, they don’t cost much, and in principle they are consumables. Gone are the days when they were twisted to check the gap, clean with sandpaper, ignite on fire. In my opinion, they even stopped forging them, what's the point of copying a cheap consumable? Of course, there are especially thrifty ones who will drive 30-40 thousand km on candles, as my neighbor in the garages will say. But I still don't understand the savings. It’s better to spend three hundred than to listen to how the engine troit in the morning until it warms up or does not work smoothly at idle.
Dima
There were several problems with candles in long road far from housing. So now I carry a set of new candles with me. And I make a replacement every autumn, before the onset of cold weather. In winter, the most severe operating conditions, so only in autumn.
Dmitriy
We all know very well that spark plugs need to be changed, that start-up, operation, efficiency, power, etc. depend on their quality. They are considered to be "consumables" with a limited service life, so the manufacturer of both the car and the candles themselves declares a certain resource for their products.
This figure is highly dependent on the type of spark plugs (single electrode, multi-electrode, platinum, iridium, etc.)
For single-electrode candles, the resource is 30 thousand km, for multi-electrode or with a silver electrode, the resource is at least 50 thousand. There are expensive candles with iridium or platinum electrodes that nurse up to 100,000 km. Of course, this is all theoretically within the walls of laboratories, so in practice I change the candles every year in the fall (winter, one of the worst operating conditions). Just write km. when they put candles, I think rarely anyone will. Therefore, we do what is convenient. So I tied this period to winter.
Now about the signs of the need to replace the candles. The first is the operation of the engine with interruptions, tripling, etc. We take out the candles and look - most often the electrode burned out. A large deposit on the candles is possible - this is the power system not working properly, there should be no deposit during normal combustion. Defects in the ceramic insulator are also possible, they can be found by a brown mark on the insulator.
And most importantly, I change all the candles as a set, so that after a while I won’t do it again. Good luck to everyone on the road.
Fed
I completely agree with those who change candles regularly, as soon as they hear, they feel a specific noise in their typewriter. Some start talking nonsense, like you can wash it, etc. The need for inventions is cunning ... Of course, you can rinse it to save some time, but it’s better to buy new ones and replace everything right away.
Nicholas
The last time I changed the spark plugs was after 20,000 km. In the fourth cylinder, the candle had a clear breakdown, small stripes appeared on the insulator. I did not change the wires, I did not touch the candles for the entire run. In my opinion, it is cheaper to change the entire kit than to conjure with flushing and cleaning. A lot depends on the fuel, so I try not to fill in any muck. Of course, it is difficult to guess where the quality is and where it is not, but I don’t stop by the “left” gas stations.
Oleg
Due to the condition of the candles depends right job engine, so drivers need to know when and how to change spark plugs. Earlier in Soviet times in the era of a shortage of everything, we cleaned them, folded them, exposing a gap, checked whether there was a spark on them, sometimes we were shocked, but we were not afraid of anything. Now probably rarely does anyone do this and do it right, because in modern engine checking a candle for a spark can cost a couple of orders of magnitude more than the candle itself. Such a check can easily disable the ignition module, coil, and God knows what else.
Replacing candles in a car is necessary in three classic cases:
1. The engine started to work unevenly or, as they say, troit;
2. The power of the motor has fallen, you began to accelerate with effort, i.e. the engine began to pull worse;
3. Significantly increased fuel consumption.
Then we go to the auto shop. We take with us the CPC (certificate of registration) because the VIN number is registered there. You can choose the right candles only by it, neither the make of the car, nor the engine power, nor the year of manufacture, namely the VIN number.
By the way experienced driver or a service station mechanic will tell you about an engine malfunction by the color of the spark plug electrode. If the color is reddish brown bad gasoline, black thick coating - oil getting into the mixture, engine repair is needed here, etc.
Danila
In order not to bother taking into account the distance traveled, I regularly change candles in the fall, since in winter they are the most unfavourable conditions. I judge the quality of candles by appearance electrode - by the color of the deposits on it. And also in terms of the stability of the engine, if the engine “troits” or does not work stably, the first thing I look at is the candles.
Andrey
I always do a revision of the car in the fall, since winter is the most hard times for auto. I change oil, filters, wiper blades and spark plugs (regardless of their condition). It is better to be safe than to stand on a frosty road in winter. I revise the removed candles and if they are in good condition, then I use them next spring. And in the fall for the second year I throw it away.
Basil
I replace every 8-10 thousand together with the replacement engine oil, I think it’s better than the original ones, you don’t need to put a gap on them.
Anatoly
Candles of any gasoline engine work in extreme conditions. Many factors really influence their work, but in addition, the driver himself, depending on the degree of his ability to start the engine correctly, choose the right oils, quality gasoline, as well as the conditions of storage of the car. In my life I have had to store a car in different conditions, and even under a canopy in winter, this affects the engine start and the serviceability of the candles. I had a Lada-ten car. It stood under a canopy in the yard, at an air temperature of minus 25 degrees below zero, it started up like a match, as soon as the temperature approached 30 degrees below zero, it did not start the first time, and if you continued to turn it, trying to start, nothing worked. Candles were poured combustible mixture and went out of order. Even blowing the engine did not help, only the replacement of candles was required. And here, first of all, you need to know that in order to change candles, you must have a candle key, which is completely different for all types and brands of cars. You also need to know that you need to change the entire set of candles at once and buy them only of those brands and models that are recommended. specific car, in other cases, then the length of the thread will be long, then the diameter of the thread is not quite the same, it is better to immediately buy what you need.
Anton
I change candles not on how long they worked, or how many kilometers a car drove with working spark plugs. I try to change it every winter. In winter, the extremeness of the work of candles increases, new ones will work flawlessly, which for winter driving very important. That's when the car is not used in winter, it is used only in summer season, then it is better to replace the spark plugs in the spring that have stood in the engine for a long time without work, the candles may fail or even fail to start the engine.
Vitaly
I change the candles once a year, in the spring combining this procedure with an oil change. I only use the spark plugs recommended in the manual. This is much more reliable than waiting for some candle to fail on the road. You always have a set of spare spark plugs with you in the car, just in case for yourself or for that guy who is standing in the middle of the road. I always throw away the old (replaced) ones so as not to get confused. The savings will cost more. Annual mileage 13-15 thousand km.
Andrey
I changed candles, as a rule, when the engine started to triple, it started up in winter to minus 20 without problems. And we almost never have more.
