How much oil to add to the chain saw

How much oil to add to your chain saw?

On average, one liter of gasoline is mixed with 20-50 ml of oil. STIHL and Husqvarna, for example, recommend 100 ml of oil for 4 liters of gasoline. This ratio is ideal for chain saws up to 1.5 kW. For chainsaws of the same brands with power output above 1.5 kW, use a 1/50 ratio (100 ml of oil to 5 liters of gasoline).

You need twice as much oil: 40 g oil for 1 l of gasoline. Add a full tank of oil for chain lubrication.

How much gas to put in your chain saw?

During the choice of a suitable fuel, each owner of the tool should be guided by the brand and country of manufacture of the model available in the household. Older domestic-made saws called Ural and Druzhba are best fueled with AI-80 gasoline. It contains exactly those additives that are necessary for stable operation of unpretentious local engines. modern domestic models are designed to run on 92 gasoline.

Things are a little different with imported chainsaws. The motors of all these models are designed for a more forgiving fuel, so the German, Swedish, American and Japanese chainsaws need only be filled with gasoline AI-92.

An important role when selecting gasoline plays its condition. Many novice gardeners are convinced that the fuel can be poured into the fuel tank of the saw, which has been in the canister for a long time. Some believe that the tool is already working in conditions of constant dust, and that is why the carburetor manufacturers have provided a special air compensator that activates when the air filter is worn.

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This opinion is fundamentally mistaken. As a result of a long stay in the canister gasoline loses its main properties, and its composition, depending on the material of the container, is replenished by molecules of plastic or metal rust.

Because gasoline stays in the canister for so long, it begins to lose its vapor, which is what ignites when you start the chainsaw. It is because of this that gardeners face a number of typical problems, which include:

To prevent this, you should regularly use only fresh fuel from trusted gas stations. It is best to buy 2-3 liters of gasoline every morning before starting work in the garden. Using fresh gasoline will make it easier to start the chain saw, and it will significantly extend its service life.


Stricter criteria for choosing an oil component. In the best case, it is a mineral or semi-synthetic motor oil recommended by the manufacturer, designed for use in high-speed two-stroke engines with air cooling.

Mineral oils have the advantage of lower cost. Their more expensive semi-synthetic and synthetic analogues have better performance and meet environmental standards.

  • retain their operating properties in a wide temperature range;
  • do not produce soot deposits;
  • contain detergent, antioxidant, preservative and other additives useful for power unit operation.

Preparing the fuel mix: proportion of oil and gasoline for the chainsaw

The chainsaw engine is the “heart” of the tool, so it is very important to use the right fuel mixture.

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Fuel mixture for a chainsaw is prepared of two components. oil and gasoline. Chainsaws are equipped with two-stroke engines, that is why oil is not added to the lubrication system (like in a four-stroke engine) but directly to the gasoline. It is very important to follow the correct proportions of ingredients and of course not to try to use pure gasoline, because that would “kill” the chain saw very quickly.

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The oil must necessarily be designed for two-stroke engines of gardening and forestry equipment (that is, in no case can you use oil for boat motors or scooters). As practice shows, such oil can be purchased at any store or service center, where chainsaws are sold or serviced.

If we talk about what gasoline to fill a chainsaw, it is optimal to use fuel with the octane number of A-95, in this case, the savings on fuel can turn out badly. European manufacturers often indicate that you can use gasoline A-90 or A-92, but in post-Soviet countries, the quality of gasoline is inferior to European, so in our realities it is better to use higher-quality gasoline.

As for the petrol-oil mixture ratio itself, everything is simple: you need to strictly follow the instructions of the tool. All chainsaw manufacturers indicate the required ratio in the instruction manual or in the tool’s certificate, moreover, the proportions for filling the chainsaw may differ depending on the model of chain saw. As a rule, the ratio of oil and gasoline to a chainsaw from reputable manufacturers is 1:40 or 1:50, which means 1 part oil to, say, 40 parts gasoline.

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Now the arithmetic. 1 liter of gasoline = 1000 ml of gasoline, divide by 40 and you get 25 ml of oil. If we perform the same actions to the ratio 1:50, we get 20 ml of oil for 1 liter of gasoline.

As for the budget chainsaws made in China, the situation is a little different. Gasoline to oil ratio for chainsaws made in China 1:25, so we divide 1000 ml of petrol by 25 and get 40 ml of oil. the thing is that in branded chainsaws the solid build and distance between pistons and cylinders in the engine is much less than in Chinese chainsaws, that is why the required oil amount is twice as much different.

To measure out the right amount of oil, use an ordinary medical syringe of sufficient volume.

One more thing to note. pour gasoline into a dry gasoline canister first, then oil. The procedure on the contrary is fraught with poor quality fuel mixture, because oil is denser and will stick to the bottom of the canister. That’s why we can’t talk about a good mixture.

Be sure to prepare the fuel mixture in a canister and pour it into the gas tank already ready special fuel! Never cook or mix it directly in the chainsaw’s fuel tank!

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If the question of how to dilute gasoline for a chainsaw is solved, then and about fuel mixture storage conditions and shelf life it is worth to say a few words. It is best and easiest to prepare a gasoline-oil mixture for 1 liter of gasoline, it is recommended to do it immediately before working with the tool. Chainsaws have fuel tanks with capacities of 0.3 to 1 liter. In domestic use, the entire volume of the prepared combustible mixture is rarely used in a single session, so the remainder can be saved until the next session. The fuel mixture should be stored in a special canister for gasoline, in a dry, dark place. It is optimal to calculate that storage time of the ready mixture is 7-10 days

The fact that the oil on the market today is not synthetic, but organic. that is, natural. After 10 days all lubricating properties are lost, gasoline simply “eats” the oil. Naturally, you can no longer use such fuel, it can cause breakdown and failure of the chainsaw.

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At the end of the work it is necessary to drain the fuel mixture and start the chainsaw. the tool will stall (so that the saw has a dry carburetor) and now you can leave it until the next session of operation.

How to dilute

In order for the saw to serve for a long time, you need to use only high-quality fuel. You can dilute the fuel mixture yourself. Two components are required: A-92 or A-95 gasoline and a special two-stroke oil. While everything is clear about the fuel, there are questions about the choice of lubricant.

The lubricating mixture plays a critical role as it protects parts from wear, overheating, and fouling. In order not to make a mistake with the choice, it is better to visit a specialized store with a large selection of products

You can consider synthetic or semi-synthetic lubricants

The proportions in the gasoline-oil mixture are very important. For tools with power up to 1.5 kW the lubricant to gasoline ratio is 1:40, for more powerful. 1:30 and 1:20. For information on the exact proportions, see the instructions for the tool.

The mixture should be diluted in a dry container made of metal or antistatic plastic. Conventional plastic packaging is not recommended, as the resulting static electricity can ignite the fuel. The absence of moisture on the packaging is a very important and fundamental condition.

Do not mix gasoline and lubricant when you want to use lubricant with special additives. They increase its quality and give added protection. These additives are available from lube oil manufacturers and can be purchased at any specialty store.

Filling the fuel tank

To avoid unpleasant surprises, it is necessary to follow the rules for filling the fuel tank, namely:

Do not fill the tank near an open fire, do not smoke near the saw; The openings for filling the tanks should be upward, clean and dry; The tank lids should be unscrewed carefully to prevent fuel residues from spilling; Filling the tank with fuel mixture is convenient with the help of a funnel

After filling you should screw the caps all the way in and lock them. This will protect against accidental unscrewing;

  • Every time you fill the tank, check it for leaks. If it leaks it is dangerous and absolutely forbidden to operate the saw;
  • Do not start the saw while you are filling. We need to move a few meters away.

Watch this video to find out how to fill the tank correctly. This instruction manual is an important part of chain saw safety. whether it’s a Druzhba, Ural or a foreign-made tool. If you listen to the advice in this article you can extend the life of your machine and save money on repairs.

Main chainsaw engine oil brands

STIHL and Husqvarna are two of the world’s leading providers of quality chainsaw and brushcutter lubricants. Their range includes both conventional mineral lubricants for two-stroke engines and synthetic oils for heavy-duty applications. Let’s look at the assortment in details.


STIHL HP mineral oil was especially developed by STIHL engineers for use in their machines. That’s why owners of STIHL chain saws and brushcutters are advised to use this oil.

Its color is red, its shelf life in a closed container does not exceed four years. Packaged in several types of containers, so you can choose the most convenient packaging. Not so long ago there appeared convenient 20 gram containers diluted by one liter of gasoline. Ideal for users who seldom use a chainsaw. Can be diluted and used up right away.

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STIHL HP meets the high European standards.

HP Ultra

Another STIHL oil. Synthetic-based, with improved combustion, cleanliness and engine protection.

Manufacturer’s recommendation for hard, continuous use. Ideal for low temperatures. HP Ultra is environmentally friendly. к. oil spilt on the ground, decomposes 80% in just 21 days.

Available in two containers, 100 ml and 1 liter bottles. The proportion of premixed fuel is 1:50, which means that a 100 ml bottle is enough for 5 liters of premixed fuel. Color green. Shelf life 4 years.

It is important to note that STIHL oils are tested in the company’s laboratory to ensure they meet all the requirements before they are released for sale.

In the development of oils, much attention is paid to fuel burn, cold-start performance, biodegradability, viscosity variation at different temperatures (information from the official company website)

Husqvarna HP 2-stroke

Husqvarna HP oil, like its STIHL analogue, is also specially formulated for 2-stroke engines.

According to the manufacturer, this type of oil has additives that compensate for the poor quality of fuel, which is essential for our country. Declared octane number of gasoline in service stations, rarely corresponds to actual number.

Husqvarna HP. semi-synthetic, green. Packaged in 1 liter or 10 liter containers. Mixture ratio 1: 50, t. е. 20 grams per liter. During the break-in period of the saw engine or when working in frosty conditions, it is allowed to increase the proportion to 1:40, which will give the engine more protection and increase its service life.

Today the market has a large number of lubricants for two-stroke engines from different manufacturers. For this reason, answering the question of which oil is better for a chainsaw is quite difficult. Our opinion, you should trust the reliable companies, which are STIHL, Husqvarna, Oregon, Champion. These oils will help to maximize the protection and extend the life of your tool engine.

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Unscrupulous manufacturers often disguise their products under well-known brands (Husqvarna, STIHL, etc. д.). Such oils are of low quality and can damage the engine. In order not to be cheated, it is necessary to buy lubricants from official representatives who have the necessary certificates for the products. To learn how to distinguish a counterfeit from the original, please read

Can I put engine oil in my chainsaw?

What oil to pour in your chainsaw?? It is categorically forbidden to use those oils, which are used in car engines. you need a special two-stroke oil for chainsaws, recommended by the manufacturer.

Often the best choice of oil for chain and tire lubrication will be the simplest oil grade M-8 or M-10. Its performance is adequate for the required purpose. At low temperatures it is necessary to pour oil with a low pour point, otherwise the oil pump can break down.

Peculiarities of new tool running-in

This includes sparing the chainsaw’s initial operating cycle. The technology also includes running the engine on a mix with 20% more engine oil.

The break-in time in engine hours is specified in the instruction manual. In practice, to get the tool to the working level, it is enough to work out 3-5 refills of the gas tank of the saw.

New models in the running-in do not need, but the first hours of operation of the chainsaw is not recommended to use with heavy loads.