Stihl chainsaw the proportion of gasoline and oil

Why add oil

At the heart of any chainsaw is a two-stroke internal combustion engine. It is one of the simplest single-cylinder mechanisms and does not have a separate lubrication system. The technology is such that the lubricant must enter the cylinder along with the fuel mixture, settle there, and lubricate the cylinder walls, piston rings, etc. The simplicity of the design of the tool has many advantages, among which the main one is the ability to carry out repair work on the engine and component parts independently.

Diluting gasoline that is poured into the chainsaw is required in order to extend the life of the tool. It is imperative to dilute fuel with chainsaw oil, and if, for some reason, you forgot to do this, then the operation of the tool is absolutely contraindicated.

It is important to know! Chainsaws do not have a special tank for filling oil, which would be used to lubricate the rubbing engine parts, like on cars. This is due to the simplest design of a two-stroke motor. The present tank for oil in chainsaws is designed to lubricate the chain and bar during the operation of the tool.

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

The fact that it is prohibited to pour “clean” gasoline into chainsaws is warned by sellers of buyers at the time of purchasing the tool. Many buyers find out 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.

stihl, chainsaw, proportion, gasoline

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 is worth noting 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 allow achieving the fuel mixture of the required technical qualities.

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 the 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:

  • Stihl;
  • Kreissman;
  • Husquarna;
  • Sadko.

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.

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Chapter 7: Fueling Your STIHL Chainsaw

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 gas tank of the tool.

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.

Risks of using fuel and oil surrogates

To avoid premature failure of the chainsaw, it is recommended to refuel the tool with exclusively high-quality and branded consumables. Finding such materials is not difficult, as they are usually sold in branded retail outlets. The use of low-quality gasoline can lead to engine failure, therefore, it is recommended to buy fuel at such filling stations where high-quality fuel is guaranteed.

It is categorically contraindicated to mix gasoline with motor oil for cars, since it is not at all intended for such purposes. Compliance with the number of proportions, as well as the use of high-quality materials will extend the life of your tool for many years.

Why do you need to dilute the lubricant

At the very beginning, it is necessary to understand the reason for the dilution of the fuel. The mixture used for the chainsaw is diluted primarily to prolong the life of its owner. The instructions for it strictly prohibit operation without diluting gasoline.

The basis of the chainsaw motor is a piston internal combustion engine. It consists only of a cylinder, therefore it does not have additional systems for lubricating parts. The mixture enters it, settles, lubricates the piston rings and walls. In tools such as chainsaws, oil and gasoline are a one-of-a-kind lubricating fluid. The mixture extends the life of the functioning of all parts.

In addition, it contains additives that are beneficial for engine operation. Possesses antioxidant, preservative and other properties, which are also useful for the engine and its parts.

What are the proportions to dilute the components for the mixture

The high-quality operation of the chainsaw will depend on the correct filling of the chainsaw with a mixture of lubricants and fuel. To determine the proportion of the components and how to dilute the fuel, it is recommended to read the instructions. If you have forgotten how to dilute, or have lost the instructions, you can go to the Internet for help. It should be said that the proportion between oil and gasoline for a chainsaw must be observed exactly.

The most common gasoline to oil ratio is 1:50.

That is, one liter of gasoline is diluted with twenty milligrams of lubricant. This ratio is quite suitable for tools whose power is more than one and a half kilowatts per hour.

For those chainsaws whose power is less than one and a half kilowatts per hour, it is recommended to mix gasoline with oil in a ratio of 1:25. That is, one liter of gasoline is diluted with twenty-five milligrams of engine oil.

It must be remembered that the presence of a large amount of oil in gasoline will lead to rapid wear of parts. When the level is exceeded, the load on the cylinder and piston increases. Carbon deposits form faster.

In addition to the instructions, you need to know what kind of oil you need to add for the chainsaw. Since there are many varieties, it is difficult for the ordinary owner of a chainsaw to choose the best one offered. Let’s consider some of them.

Gasoline and oil proportions

For example, Stihl, together with quality saws, produces special lubricants that are used in these tools. Special oils are produced by companies such as:

The above three companies are simultaneously manufacturers of chainsaws and special lubricants for them. The next step in proper tool maintenance is the saw refueling algorithm.

What oil to use?

The oil, as already mentioned, should be for two-stroke engines. over, it should be suitable specifically for chainsaws, as indicated on its packaging. There are just two-stroke oils, for example, purely for boat motors or scooters. They should not be used, since the operating mode of such equipment is not so intense, therefore, the requirements for oil are somewhat lower.

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

How to choose a little for chainsaws

  • The most common oil for use in chainsaws, available to most Russians, is API.TV engine oil.
  • Another brand is also used. API-TC, but here the manufacturer’s permission is required for the use of the material, as well as for its amount when added to gasoline.
  • There is another option, for saws with light loads, API-TC oil can be applied here.
  • All of these brands are classified by the American Petroleum Institute, but there is another equally popular series of oils produced by the Japanese. They also classify the lubricants produced according to performance classes. For the operation of chainsaws, JASO-FB and JASO FD fuels and lubricants are recommended.

Note! Do not use oils designed for four-stroke engines in chainsaws with two-stroke engines.

In the second case, the lubricant must completely burn out. This effect can be achieved only through the use of synthetic oil, it gives a minimum of smoke and leaves almost no residue behind. It is important to study the instructions for use and mixing consumables for a particular brand of 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 marks, some brands (along with chainsaws and oil) produce containers for mixing and storing fuel. Made of a 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).

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Often, improvised means are used for mixing:

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

When using household products, be extremely careful, because 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.

What gasoline is suitable for a chainsaw

Old models of Russian chainsaws normally run on A-76 gasoline, but for chainsaws produced abroad, it is better not to use this fuel, but to fill the tank with higher quality gasoline, such as A.92. But, here the question may arise about the quality of the very gasoline that is purchased at gas stations in the country, because it often does not correspond to the declared composition. In order not to risk in vain, some owners of imported chainsaws buy 95 gasoline.

It is also not advised to use fuel that has stood unnecessarily for a long period. The fact is that gasoline is capable of losing its main characteristics over time. For example, the octane number in the composition of gasoline is of great importance, with a decrease in which, when operating the saw, a decrease in engine power may occur.

The chainsaw may become inoperative due to poor quality fuel filling. Sometimes such a mistake is very expensive for the owner, since the repair of a broken mechanism costs much more fresh and expensive gasoline.

The correct proportions of gasoline and oil in the operation of the chainsaw

Those who constantly use a chainsaw, like no one else, understand that the correct ratio of oil and gasoline when refueling a mechanism depends on how long and efficiently it will serve. Before using a power tool. you should pay attention to its brand and features, since each manufacturer recommends a different ratio of fuels and lubricants.

How to refuel gasoline equipment, the correct ratio of oil and gasoline and the preparation of various working mixtures will be discussed in this article.


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

The ratio of the amount of oil and gasoline for the fuel mixture

The proportion of oil and gasoline for a chainsaw is usually made up according to two recipes:

  • 50 servings of gasoline per serving of engine oil
  • 40 servings of gasoline per serving of engine oil

If the chainsaw was recently purchased and has not yet been operated, then the share of lubricant is increased by a quarter. The same amount is poured into fuel when cutting at temperatures below 2 degrees.

It is not difficult to get such a mixture. Almost every modern saw is equipped with a special two-section container. Oil is poured into a smaller part of it, and gasoline is poured into a larger part. The lids of both parts are tightly twisted and the container is turned over, shaken thoroughly. This achieves a complete and homogeneous mixing of both components.

If there is no such special container, then you can use any gasoline-resistant plastic container with a one-liter lid and a disposable syringe for 5-10 cubes. The tank for gasoline must first be cleaned of various pollutants and water. After that, one liter of 92-95 gasoline is poured into it.

In parallel, 20 ml of oil is drawn into the syringe. If refueling is done in cold weather, then you need to take 24-30 ml. We carefully pour it into a container with gasoline. It is tightly closed with a lid and shaken thoroughly until the components are completely mixed.

Why you need to mix oil and gasoline

Recommended brands of fuels and lubricants for powering chainsaws

The specific brand of gasoline for the saw is always given in the manufacturer’s instructions. It is recommended to strictly follow it.

There are 2 types of oil:

  • for engine,
  • for chain and bar lubrication.

Do not confuse or misuse them. This is guaranteed to damage the tool. Repairing it can cost almost as much as a new saw.

The most popular chainsaw lubricating oils are:

  • Husqvarna
  • Kreissman
  • Sadko
  • Stihl

Each container with branded oil always indicates the proportion of oil and gasoline for a chainsaw (Stihl, Husqvarna, Partner, Ural), which must be adhered to when making a mixture.

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.

Step by step instructions for refueling

If you want to refuel your chainsaw, you need to follow a simple algorithm:

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 spoken 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 also will not lead to anything good. What exactly will happen can be seen in the attached video.

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What will happen if you do not take into account the manufacturer’s recommendations?

In case of violation of the rules for the preparation of fuel and lubricant mixtures and non-observance of the proportions when adding oil to gasoline at the Stihl 180 chainsaw; the following problems arise:

  • With an increase in friction, the wear of the working surfaces of parts will increase.
  • Insufficient lubricant will cause bearings to deteriorate.
  • The full functioning of mechanical units is disrupted due to premature wear of parts, their service life is significantly reduced.
  • When using low-grade gasoline and oils, the performance of the unit decreases with the subsequent breakdown of important components and parts.

The fuel is prepared before refueling the saw, avoiding excessive contact with oxygen. After finishing work, the remaining mixture must be drained.

HP Super

Designed for high-performance engines and four-stroke engines made using 2-MIX technology. The characteristics are slightly worse than that of the HP Ultra, so at the moment HP Super is not available on the counters of official Stihl dealers.

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 for 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.

The highest quality product is considered to be the product of Husqvarna, followed by Lukoil machine oil.

The advantages of these oils:

  • Low consumption.
  • Maintaining quality.
  • Ability to maintain technological qualities for a long time.
  • Can work in extreme conditions.
  • No toxins.
  • The minimum amount of carbon deposits.

Many professional tools use a lubricant made using API-TB technology (USA). Products made according to the JASO-FB method (Japan) are also popular.

It is permissible to mix oils from different brand manufacturers with similar characteristics. Mineral and synthetic oils are incompatible. The best oil for household chainsaws is considered “Standard”, for professional equipment the technical fluid “Ultra” is optimal.

Some oils can successfully replace each other. For example, substances produced by Husqvarna and Stihl. Lubrication for scooter engines or motor boats is not suitable for chainsaws, the oil quality in them is low. If the proportions of oil and gasoline are not maintained, then the tool will quickly fail due to the abundant formation of carbon deposits.

What gasoline should you use for your chainsaw? How to breed it correctly?

The chainsaw is simple in design and is sometimes needed in a private household. The device cannot work fully if you do not use the correct fuel mixture, which should be able to prepare.

How to prepare the mixture?

In order for the equipment to serve for a long time and to properly cope with its functions, it is necessary to know exactly how much oil must be added to gasoline for the Stihl chainsaw. Earlier, we found out that it is better to use a lubricant product from the manufacturer Stihl and unleaded AI92 or AI95 gasoline as components. Leaded fuel grades adversely affect the operation of the unit and disable it. With such components, 20 ml of oil is added to the mixture per liter of gasoline. Any violation of the proportions leads to the appearance of carbon deposits on the spark plugs and pistons, as well as the formation of scoring. The oils used can be green, blue or red.

Their presence is easily determined by the color of the mixture. To dilute fuel, often complete with equipment, a special canister is attached. These containers have graduated marks and two holes. The user only needs to fill the tank with the components of the mixture to the required marks, close the lids and mix. Some people use plastic bottles and syringes to measure oil for this purpose. In this case, it is necessary to ensure that foreign particles or water do not get into the container, all this will worsen the operation of the engine.

Quality components needed

Practice proves the influence of the quality of the prepared mixture, taking into account the required proportions, on the service life of the tool, power, productivity:

  • It is not recommended to use components that have reached the end of their shelf life.
  • It is especially important for the constituent parts of gasoline and oil. do not use components obtained on the basis of gas condensates, since the molecular structure contains harmful ones, for the internal combustion engine, add water.
  • Partial non-compliance of AI-92 with international standards. AI-95 grade is saturated with additives that damp the detonation moments of the internal combustion engine.

How to mix fuel for chainsaw

The noted disadvantages limit in time the service life of hand-held chainsaws, the internal combustion engines of which operate on complex consistencies of a combustible mixture.

Mixing ratio

Very often people ask the question, how much oil per liter of gasoline is considered the norm. It is easy to answer it, because the instructions for any Stihl chainsaw, as well as on the additive package, indicate that when using original Stihl products, the proportions of oil and gasoline should be 1:50. This means that for one liter of fuel, it is necessary to add 20 ml of the additive.

During the running-in period of a new chainsaw, it is allowed to slightly increase the amount of oil by one liter of gasoline. For example, you can dilute one liter, 25 ml of oil, this will reduce the load on the rubbing parts and extend the life of the chainsaw.