What is the ratio of oil and gasoline in a chainsaw

what is the ratio of oil and gasoline in a chainsaw

Hello! This article will focus on the correct ratio of oil and gasoline for a chainsaw. This is perhaps the most important thing to know when operating this device. Lack of oil will lead to excessive friction, and too much of it. to excessive occurrence of soot and overheating. As a result, both of these will lead to a quick engine breakdown. Repair can get up at half the price of a new chainsaw.

In addition to the correct proportion, we will also discuss other important things that will allow you to serve your chainsaw for as long as possible. which gas to use, which oil to use, dilution methods, shelf life of the finished mixture, etc. so I advise you not to quit reading the article after the section on proportions , since further information will also be useful to you.

Correct proportions

So, I won’t be going around for a long time, but right away I will turn to the numbers. The most common dilution proportions are 1:50 and 1:40. That is, one part of the oil is poured onto 50 or 40 parts of gasoline. For those who do not understand, I will explain in more detail. We take one liter of gasoline and divide it by 50 or 40, respectively. As a result, we get the right amount of oil per liter of gasoline. That is, one liter is 1000 ml. Divide 1000 ml by 50, we get 20 ml of oil. Divide by 40, we get 25 ml. That is how much oil you need to add to one liter of gasoline.

But you will say that you don’t know what proportion should be on your chainsaw. Well, if you lost the instruction or for some reason there is no information about the proportion, then you can use the following rules:

  • if the chainsaw and oil are from the same brand (for example, Stihl chainsaw and Stihl oil), then dilute gasoline with oil in the proportion indicated on the oil (usually 1:50);
  • if chainsaw and oil of different brands, then observe a proportion of 1:40;
  • if the brand is the same, but there is no information on oil, then breed in a proportion of 1:40;
  • if you don’t know anything at all. you don’t know either the brand of the chainsaw or the oil. then you still breed in the ratio 1:40. The main thing is to know at the same time that the oil is exactly suitable for two-stroke chainsaw engines.

If the saw is new and is being tested, the amount of oil for the first three refueling of the fuel tank is recommended to be increased by about 20%. That is, the proportion 1:50 turns into 1:42, and 1:40 at 1:33. Or 24 or 30 ml of oil per 1 liter of gasoline, respectively. Well, I note here that in addition to increasing the amount of oil in the fuel mixture, no more break-in measures with a chainsaw are needed, unless otherwise specified in the instructions. That is, it is not necessary, for example, to leave it to work for a long time at idle or to cut it not at full speed, since this will lead to its overheating and faster failure. Always cut at maximum speed. And after the development of three fuel tanks (meaning the chainsaw tank), go to the usual proportions of 1:50 or 1:40.

But sometimes it happens that the manufacturer indicates a different proportion compared to those that I cited above. For example, 1:25 or 1:32. In this case, it is necessary to observe precisely these proportions. Although if you know about them, then what did you forget in this article?

Which oil to use?

Oil, as already mentioned, should be for two-stroke engines. At the same time, it should be suitable specifically for chainsaws, as indicated on its packaging. There are simply two-stroke oils, for example, purely for outboard motors or scooters. They should not be used, since the operating mode of such a technique is not so intense, therefore, the oil requirements are somewhat lower.

At the same time, there are oils where it is indicated that they are suitable for both chainsaws and boat engines and scooters. Such oil can be used. But if it is only for outboard motors or scooters, then it is impossible.

Oil producers

One of the best oils, admittedly by most experts, is produced by Stihl, the one that also does chainsaws very well. Therefore, if you have an expensive chainsaw, then it is better not to save by buying cheaper oils.

Another major global manufacturer of chainsaws. Husqvarna. also produces two-stroke oil of the same name. But many users noted that when applied to other brands of equipment, it leads to excessive smoke, and in general chainsaws do not work at full capacity. At the same time, the Husqvarna technique itself works perfectly on such oil. Therefore, if you have a Husqvarna chainsaw, then buy the same oil for it. For other equipment it is better not to take it.

Video: What is the ratio of oil and gasoline in a chainsaw

There are also well-known world brands producing various malas, including push-pull ones. For example, Ravenol. Oil from such manufacturers can also be bought without fear.

There are oils produced. In principle, they are not bad if the saw is used in domestic use. That is, of course, it will slightly reduce the life of the chainsaw, but in everyday life you will not notice this, since the chainsaw engine in any case in such sparing operating conditions serves for many years. For professional activities, I do not recommend taking such an oil.

Oil color

Two-stroke engine oil is usually red, blue or green. This does not affect the performance properties. The dye is added only so that in the future you do not confuse the gas-oil mixture with pure gasoline and pour it somewhere where it is not supposed to be poured.

Mineral or synthetic?

Yes, as with automobiles, there are both mineral and synthetic oils for chainsaws. Due to the lower price, in most cases, mineral oil is used. However, synthetic provides a longer service life of the chainsaw, since there is no soot left on the cylinder walls with it.

But do not be afraid of mineral oil if you can not get synthetic. With him, even carbon deposits are, but not so much. Nevertheless, the service life of a saw with such oil will be slightly lower (but not catastrophically).

What you just can’t do exactly is to start using synthetic oil after a mineral water has been used on your chainsaw for a long time (more than 100 hours). This is due to the fact that synthetics will wash away the accumulated soot and it can get into pieces where it is not necessary. Therefore, if you started to use mineral oil initially, then use only it.

Which gasoline to use?

Gasoline for modern chainsaws is better to use AI-92. 95th is better not to apply. Firstly, because the saws are configured to work precisely on 92nd gasoline. And, secondly, 95th gasoline is obtained by adding special additives to gasoline with a lower octane rating. And as experts say, this is not good.

In general, fill in the 92nd gasoline and you will be happy. Just don’t stock up on him, because with long months of storage, his octane number drops.

In general, they say (they say!) That our refineries can produce in their pure form only the 80th gasoline. But already due to additives they bring it to the 92nd and 95th. In the 95th, naturally there are more additives. So, with long-term storage, these additives "evaporate" and gasoline again becomes 80th. Whether it’s true or not, I don’t know, but I learned this information back in 2009 at one of the gas service workshops from the head of the Russian service department of one of the gas technology manufacturers. If this was true, then maybe for today (2018) the situation has improved.

In any case, it is better to buy gasoline at proven gas stations where you have already refueled and everything was fine.

Shelf life of the finished fuel mixture for chainsaws

So, clean gasoline can be stored for not very long, and the finished fuel mixture is even less. Some manufacturers indicate that diluted storage is allowed for up to one month.

But experts recommend storing no more than 8-10 days.

Just as soon as you mix, the oil immediately begins to gradually lose its properties. As a result, in just a few days this fuel mixture is not the same as it was originally. What can we say about storage for more than a month.

Therefore, do not cook the mixture for the future. You need to cook as much as you intend to use for your upcoming work. How much you need to procure, only experience can tell. If you don’t have enough yet, prepare no more than one liter of fuel mixture. If it is not enough, then cook again. this will not be long. If it remains, then it will not be so large as to regret it.

Store the finished fuel mixture in a closed, opaque container. Or, if the container is visible, then put it in a dark place. The container must be petrol resistant. For example, plastic bottles from various drinks (“one and a half”) will not work. Their plastic is corroded by gasoline and all this muck gets into the engine.

You can use special metal or plastic canisters for combustible materials. Or simply use an empty canister from under any used oil, rinsing it several times with clean gasoline from the inside. Glass containers are also suitable, but it should be borne in mind that they are easy to break.

How to breed correctly?

The numbers of dilution proportions are not in vain given with such accuracy. That is, it does not say that “take about so much oil. ” The exact proportion cannot be observed by eye, so you will have to use something that will allow you to measure the exact amount of oil and gasoline.

Complete with some inexpensive chainsaws is usually a measured tank with risks. As a rule, it has several scales for different proportions. Or one, if the manufacturer implies that this tank will only be used with a saw, with which it comes with the kit. There should be two horizontal risks on this scale. The bottom shows the level to which you need to pour gasoline. The top is the level to which the mixture should reach after adding oil to gasoline.

To more accurately measure the oil, you can use a medical syringe. Preferably not less than 20 ml.

In general, pour gasoline into the measuring container, add the right amount of oil measured by a syringe and shake.

The preparation of the mixture must be done in a separate container, and not directly in the tank of the chainsaw. Otherwise, the oil, not having time to dilute with gasoline, can get into the carburetor, which will complicate the factory, up to the need to remove the carburetor and clean it.


Well, I think this is all the necessary information on the fuel mixture for chainsaws. Armed with it, you guarantee yourself a long engine life of your chainsaw. I also have a lot of other useful information on petrol and power tools on my site. you can read it. And I will end this article. goodbye and many years of service to your chainsaw!