How to mix gasoline for a chainsaw


Not only the quality and proportion of fuels and lubricants is important (although it is dominant in this matter), but where and how (how) gasoline is diluted with oil for chainsaws.

The technology provides for the use of containers with graduated divisions, some brands (along with chainsaws and oil) produce containers for mixing and storing fuel. Made of special non-combustible material, they are produced in the form of a canister or bottle, often endowed with measuring lines, and some of them have two entrances (separate for each type of fuel and lubricants).

Often, improvised means are used for mixing:

  • Plastic / glass bottles;
  • Syringe (no needle);
  • Measuring cups;

When using household products, be extremely careful, as during the mixing process, when combustible material interacts with the surface of non-specialized containers, static electricity can be generated. this is fraught with an explosion. When making a mixture, oil is added to gasoline, since it has a higher density.


There are several options for the ratio of fuel and lubricant. As a rule, this number ranges from 20 to 50 ml of oil per 1 liter of gasoline.

Again, you must follow the instructions for the product or the recommendations indicated on the oil label (priority of the instruction). In the absence of such, before diluting gasoline, you need to pay attention to the power indicator of the product, since the created proportion directly depends on it.

For chainsaws with power:

  • Up to 1.5 kW, the recommended ratio is 25 ml of oil per 1 liter of gasoline;
  • Above 1.5 kW 20ml / l.

In gasoline for a chainsaw, it is allowed to add oil a little more than the recommended proportions (up to 5 ml per 1 liter). In this case, you should be extremely careful, because non-observance of the proportions can lead to breakdown, and as a result, expensive repairs.

If gasoline is diluted with a large volume of oil, then during operation the number of shock loads on the cylinder-piston system will be increased, and carbon deposits may also form, as a result of which the CHP will fail.

Adding a small amount of oil to gasoline for a chainsaw can lead to insufficient lubrication of the surfaces of moving elements, which will lead to additional friction of the elements and their heating, followed by the destruction of the entire mechanism.


According to the international classification, oils of the following markings are used for chainsaws:

  • API-TB;
  • API-TS;
  • JASO-FB;
  • JASO-FD.
  • Use oil for 2-stroke engines only;
  • Do not use the material after the expiration date;
  • It is strictly forbidden to add mining (it contains many unnecessary impurities. harmful to the central mechanism of the chainsaw);
  • You can not use chain lubricant (for each device: chain and engine. it is its own);
  • It is preferable to use synthetics or semi-synthetics (during development, it almost does not form combustion products, but the price of such material is higher than that of mineral oils).

How to dilute gasoline with chainsaw oil


  • High quality fuels and lubricants;
  • Correct proportions;
  • Mixing tools and technology.


According to experts, it is necessary to use unleaded fuel with an octane rating exceeding 90. Gasoline A92 and Ai92 is considered ideal. You can use the 95th, but there is an opinion that it is better to refrain from this kind of gasoline, since some of them are made on the basis of the 92nd with the addition of additives. The latter, in turn, are harmless for 4-stroke car engines, but they will be superfluous for the “sensitive” mechanisms of 2-stroke motors.

It is recommended to use fresh gasoline for chainsaws, since when stored in cans the fuel can lose its octane properties.

Fuel quality

If you want the tool to do its job perfectly and last for more than one year, you must provide it with fuel and lubricant of the proper quality.


It is recommended to dilute the fuel in a small amount without excess. It is impossible to store such a mixture for a long time (the properties of gasoline are lost), up to a maximum of 25-30 days. At the end of the work, it will not be superfluous to drain the remaining fuel and idle to work out its resource. This is due to the fact that storing the mixture in the product tank increases the wear of the seals.

Remember, the use of high-quality fuel and compliance with the manufacturer’s recommendations guarantees a long and fruitful operation of the product.

Chainsaw refueling instructions

Knowing the ratio of the preparation of the petrol-oil mixture, you can start refueling it. Refueling instructions are as follows:

  • First you need to prepare the mixture. Having combined the two main components, you should mix them thoroughly.
  • Place the tool on a clean and level surface. Before unscrewing the gas tank cap, it is necessary to clean or blow off sawdust, dust and dirt.
  • The filler neck must point upwards.
  • Install a small watering can in the neck, then pour fuel
  • Control the refueling process, as the volume of the tank is small, so it fills up quickly
  • Do not fill up to the full maximum, since when the tank cap is closed, the remaining fuel will splash out.
  • After the fuel is poured into the tank, immediately add chain lubricant.
  • The consumption of fuel and chain lubrication is approximately the same, therefore, both tanks must be filled at the same time.
  • After refueling, you can start starting the engine
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It is better to start the engine not in the place where the refueling was carried out, but to move to a distance of 2-3 m. The tool is ready for work, and you can start to start it. How the chainsaw engine starts, you can read in this material (link).

Why is gasoline mixed with oil for refueling chainsaws

It is necessary to dilute gasoline with oil in order to avoid the failure of the internal combustion engine. The reason for this is the design features of the lubrication system for two-stroke motors. In the design of such engines there is no chamber for filling engine oil, and if you fill in fuel without lubricant, then the crankshaft, piston, bearings and connecting rods will not receive lubrication. This will significantly reduce the service life of all the listed parts, therefore, it is prohibited to fill in clean fuel.

Gasoline and oil for the chainsaw must be poured in the appropriate proportions, which makes it possible to effectively lubricate the rubbing parts. Lack of lubricant or its excess will lead to negative consequences in the form of carbon deposits. In order for the tool to work properly, it is necessary from the first day of operation of the tool to fill it not only with high-quality materials, but also observe the correct proportions.

For the engine to work properly, the main thing is to fill it with clean fuel without contamination.

Chainsaw “Stihl

For the Stihl saw, the manufacturer recommends using unleaded AI-92 or AI-95 gasoline. In addition, the company produces oils for fuel preparation for its tools. If you bought a Stihl chainsaw, how to dilute gasoline with oil? In the attached instructions it is recommended to use it in a mixture of petrol and oil in a ratio of 1:50. This means that 20 ml of oil is added to each liter of gasoline and best of all from Stihl.

Do not violate the ratio, this will cause malfunctions in the tool. Often, complete with the equipment, the manufacturer also attaches a special canister with marked graduations and two holes into which the necessary ingredients for mixing are poured.

What will happen if you pour working off into a chainsaw

When a chainsaw owner has been using it for a while, they may want to do some modification to the tool. And it’s good if his desires are limited to the purchase of various attachments that expand the functionality of the chainsaw. But some go further. they start experimenting with the gasoline and oil that their saw runs on.

If we have already talked about gasoline earlier (most modern saws require it with a high octane number. at least 92-95), then it is worth mentioning the oil separately. Many car enthusiasts accumulate a significant amount of used engine oil during vehicle operation. And therefore, some have a desire to use this material for refueling a chainsaw.

If you do this, then it is guaranteed that the engine will fail. This is primarily due to the low lubricity of the recycled oil. It will burn with a lot of black soot. The metal particles contained in the oil will first clog the fuel filter (these are the larger particles), and then the cylinder O-rings will fail. A metal suspension in the oil will damage both the surface of the cylinders themselves and the bearings.

Some “innovators” try to use the working off to lubricate the chain itself and the block on which it is located. It will also not lead to anything good. What exactly will happen can be seen in the attached video.

What will happen if you pour working off into a chainsaw

If you do not want your chainsaw to fail at the wrong time, use only high-quality fuels and lubricants. It is forbidden to mix working off with gasoline. The reasons for this are the following factors:

  • Other viscosity of the material, therefore, mining is not able to provide effective lubrication of rubbing parts and mechanisms
  • The mining contains small particles of metal and shavings, which, getting into the tank, will cause clogging of the fuel filter and channel. If the grease enters the cylinder along with small particles, they will leave their imprint in the form of accelerated wear of the piston rings.
  • Emitting a lot of black smoke, which indicates burning oil
gasoline, chainsaw

It is impossible to pour surrogate materials not only into the gasoline tank, but also into the chain lubrication tank. What happens if you use the development in the tank for chain lubrication can be seen in the video.

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Using the instructions, you can independently prepare the correct fuel mixture on which the chainsaw will work. If the fuel mixture is diluted incorrectly, not only will the tool life be reduced, but also its performance will decrease.

The proportion of oil and gasoline for a chainsaw: how to dilute

All modern chainsaws are equipped with a two-stroke engine. Its long and trouble-free functioning directly depends on whether the proportion of oil and gasoline is correct for the chainsaw. The variety of tool brands and the features of each of them are the reason that this procedure is not easy for most novice users of chainsaws.

How To Mix 2 Stroke Oil (Oil and Gas)

Saw refueling algorithm

The gasoline / oil mixture is best prepared in a 2.5 liter plastic bottle if you have to refuel the tool frequently. If you need to prepare fuel for just a few fillings, then it is better to use a smaller container. It is definitely recommended to acquire measuring containers, this will allow you to maintain the exact proportions of both liquids. Most oil manufacturers offer such measuring devices.

Initially, fuel is poured into the container, and then oil is added. It is imperative to take into account that there must be enough space in the container to thoroughly mix the fuel mixture.

It is important to know! It is categorically contraindicated to prepare the fuel mixture directly in the tool’s gas tank.

After preparation, it is recommended to store this mixture for no more than 2 weeks. It is recommended to shake the mixture thoroughly with each refueling. If you are not sure that all the fuel will be used up, then it is better not to cook it in large quantities.

How to choose the right mineral oil

The correct raw material must be selected before diluting the gasoline with saw oil. This will make it possible not only to facilitate the process of its operation, but also to increase the resource of the engine of the apparatus.

First of all, it should be noted that almost every model of gasoline saws is equipped with a 2-stroke carburetor engine. In their design, there are 2 separate tanks. for gasoline and oil. Domestic devices require the use of conventional oil mixtures, which are used for refueling motorcycles. At the same time, devices of a foreign brand require the use of exclusively branded oil for a chainsaw. If mixtures of a domestic manufacturer were used for this equipment, then its productivity will decrease and its operational life will decrease.

If we talk about what kind of gasoline to pour into the chainsaw, then it will be optimal to use fuel with an octane rating of A-95. As for the oil, it is best to use a branded product.

Typically, technician users dilute chainsaw gasoline with a motor or transmission oil product. Each brand has individual characteristics that can be studied in the attached instructions. For example, the first option is used as fuel for Husqvarna instruments, and the Stihl saw is refueled only with the transmission.

Which brand to use motor oil?

For each model, the manufacturer advises a list of materials to be used. It is better for the user to adhere to these recommendations, because the warranty does not cover tool breakage due to inappropriate fuel and lubricant. In this case, the owner himself pays for the repair of the chainsaw, which can be up to 80% of its cost. When you can’t follow the manufacturer’s recommendations, try to follow these rules:

  • Use oil only for 2-stroke engines.
  • Do not use after the expiration date.
  • Do not add used oil with a large amount of impurity to gasoline, as the mechanisms of the tool can be damaged.
  • Chain lubricant cannot be used for the fuel mixture.
  • It is preferable to use synthetic and semi-synthetic oils, which are more expensive than mineral oils, but do not form harmful deposits.

What gasoline to pour into a chainsaw?

According to experts, you should use unleaded gasoline, obtained by adding lead-free additives, the octane number of which exceeds 90. For foreign models, it is required to fill in gasoline of higher grades and use branded oils from tool manufacturers. The AI-92 grade fuel is considered perfect. How to dilute gasoline for the Stihl 180 chainsaw? In this case, oils are meant in a mixture of 1:40. AI-95 fuel is also quite suitable for it, but according to professionals it is better not to use it for chainsaws.

The fact is that it is made on the basis of AI-92 with the use of certain additives that change the quality of the fuel. These components are deposited on the inner parts of the tool and, upon reaching a critical mass, begin to flake off, disrupting the operation of the mechanism. The best option is to follow the instructions that come with the selected model. It is recommended to use fresh gasoline, because during long-term storage in containers, octane properties are lost.

Ratio of oil and gasoline for chainsaws

How much oil to add to gasoline for a chainsaw is indicated, first of all, in the operating instructions for the tool. If you have forgotten what the proportion of oil and gasoline should be, then you can always open the instructions and update your knowledge. If the instructions are lost, then this material will help you. To begin with, it should be noted that there are several options for mixing oil materials with fuel. Choosing any, it is worth noting that the main criterion for each is the correctness of measuring the components. Only the exact observance of the proportion of oil and gasoline will make it possible to achieve the fuel mixture of the required technical qualities.

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One of the most common proportions is 1:50. This means that 1 liter of gasoline must be diluted with 20 ml of oil. Such a recipe for preparing a mixture is relevant for tools whose power exceeds 1.5 kW. This option is one of the most popular, so if you have forgotten the exact proportions for your instrument, then you can always focus on the first option.

The second option provides for a ratio of 1:25. Mixing 1 liter of gasoline with 10 ml of oil is recommended by Chinese manufacturers for their tools. For tools whose power does not exceed 1.5 kW, it is recommended to pour oil in the amount of 25 ml per 1 liter of gasoline. Each manufacturer’s chainsaws have their own restrictions, and recommendations for preparing a fuel mixture, which are recommended to be followed. The above are two main options that are universal.

It is important to know! An excessive amount of the oil mixture in the fuel is also negative, since this will lead to a reduction in the engine resource due to increased shock loads on the cylinder and piston, and will also entail the formation of carbon deposits.

Not everyone knows what kind of gasoline to pour into a chainsaw. This is also indicated in the technical documentation for the chainsaw. In modern saw models, it is recommended to pour fuel of a grade not lower than AI-90, that is, AI-92 or AI-95. And it doesn’t matter who the tool manufacturer is, China or Europe. Professionals recommend using AI-92 gasoline, since in Russia the 95th is in most cases produced from 92 by adding additives. If you know for sure that this is really pure 95, then it is better to use it.

Many craftsmen continue to pour gasoline of grades lower than AI-90 into modern models of chainsaws, as it was allowed to do this for outdated models of tools: “Friendship”, “Taiga” and others. This is not recommended.!

What kind of oil to use to lubricate the chainsaw chain depends directly on the model of the tool. Stihl branded saws and the like produce special lubricants that are intended only for use in such tools. Recommended oils can also be found in the technical documentation. When choosing a lubricant, you must pay attention that it is necessarily intended for two-stroke engines. Oils for mixing with gasoline and for lubricating chains differ in composition, quality and purpose. You cannot mix them, as this will accelerate the failure of the instrument. Recommended oil brands for two-stroke engines:

gasoline, chainsaw
  • Stihl;
  • Kreissman;
  • Husquarna;
  • Sadko.

Shelf life of the finished fuel mixture

Motorists know that it is not worth storing gasoline for a long time, and the finished fuel mixture deteriorates even faster. It is necessary to mix the required proportions of oil and gasoline for the Stihl chainsaw before starting work. Manufacturers allow storage of finished fuel up to one month, and experts recommend reducing this period to 10 days. Immediately after mixing, the solution begins to lose its original properties and over time it becomes not at all of the same quality as it was prepared. Learn to prepare enough saw fuel to be consumed in one go. It comes with experience. The mixture should be stored in a gasoline-resistant, opaque, tightly closed container. For this, any cans made of plastic metal for combustible materials are suitable. And also use a container of oil or glass containers made of dark glass.

Consumer reviews of Stihl saws are mostly positive. It is lightweight and affordable. There are some complaints about the low power of the instrument. But for occasional use at home, it is quite suitable. And if you use the correct proportions of oil and gasoline for your Stihl chainsaw, it will last for many years.

The proportions of gasoline and oil for chainsaws: features of the preparation of the fuel mixture

The fact that it is forbidden to pour “clean” gasoline into chainsaws is warned by sellers of buyers at the time of purchasing the tool. Many buyers learn about this for the first time, wondering why it is necessary to dilute gasoline with oil. If you neglect this rule, then the consequences for the tool can be simply catastrophic. In most cases, even a major overhaul of the engine will no longer be able to help. In the material, we will find out what the proportions of gasoline and oil should be for refueling a chainsaw, and also what the risk of non-compliance with this rule.

gasoline, chainsaw