How To Dilute Gasoline For Lawn Mowers


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 serve for more than one year, you must provide it with fuel and lubricant of the proper quality.


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 working off (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

The surest solution is to follow the recommendations specified in the instructions for the product! In the absence of such an opportunity, you can use a special fuel preparation formula.

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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-compliance with 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.


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

The correct proportion of lawnmower and chainsaw oil

Manufacturers of engine oils for two-stroke engines give very vague recommendations for the proportion of the fuel mixture. They refer to the terms of use and recommendations of the tool manufacturers.

What happens 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 fail.
  • 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.

dilute, gasoline, lawn

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

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 mark in the form of accelerated wear of the piston rings.
  • Emitting a lot of black smoke, which indicates oil burning

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.

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.

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What manufacturers recommend?

In the photo above, the oil I use to refuel my tools. If you look from the reverse side, then the label contains information about the preparation of the fuel mixture, but it is rather blurry.

The proportion can be from 1:25 to 1:50, depending on the operating conditions and the recommendations of the tool manufacturer. Ok, so before preparing the fuel mixture for my mower, I must look in the instructions for the proportion.

I have a Chinese mower, like many others, I open the document and see the following.

Oh how. The manufacturer of my mower sends to see the proportion on the oil label. In general, everything is as always, some covertly recommend using only their own branded oil and “fight” for it in three ways. This is what Stihl does.

Others generally disclaim all responsibility by shifting it to the tool manufacturer, as is the case with my mower.

Jars of 100 ml

A separate story, these are 100 ml jars.

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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.

Choice of oil for chain lubrication

In addition to the engine, for which all the proportions of oil and gasoline for the Stihl chainsaw have already been found out, there is another important part, consisting of many moving links. the chain. For its lubrication, not motor oil, but chain oil is used. It has completely different properties and is cheaper.

For a new tool, only oils from the manufacturer are used, which are recommended in the instructions. Otherwise, if the saw breaks down, it will be removed from the warranty service due to non-observance of the operating conditions. It should be noted that the oils from the manufacturer are of really high quality. After the end of the warranty period, you can use any engine oil, making it change twice a year.

Chainsaw “Stihl”: which gasoline oil to use?

A number of manufacturers producing equipment also develop their own consumables that are adapted to the operation of a particular engine. So the Stihl company produces oil exclusively for its equipment. It is supplied with special additives that can compensate for the quality of the fuel, improving lubrication and cleaning of the fuel mixture. It should be noted that Husqvarna HP oil is universal and can be used for all chainsaws. It can be used at a temperature not lower than 10 degrees.

And also for two-stroke engines, products of the following brands are used: Sadko, Kraissmann, Oleo-mac Prosint. If you use a Stihl chainsaw, how much oil per liter of gasoline should you fill? The ratio will be 25 ml of additive per liter of fuel. It must be remembered that there are oils for chains and motors. They are intended for different purposes and are not interchangeable. The use of chain oil for the preparation of a combustible and lubricating mixture leads to tool breakage.

Choosing a viscosity level

The main parameters that are indicated on the lubricant canister are viscosity and temperature. For Japanese 250cc and 400cc bikes (e.g. Honda CB 400 SF), 10W-40 grade is recommended.

  • 10. temperature index at which the free movement of components through the oil channels will be carried out. Covers the temperature range from minus 20 to plus 35.
  • 40. viscosity when the engine is heated.

If the operation of motor vehicles occurs in the heat or in off-road conditions, and dirt constantly adheres to the parts, which also increases the internal temperature, you can opt for 10W-50. But the most important thing is to read the manual before buying and follow the manufacturer’s recommendations.

Two-stroke motorcycle oil

It seems that when developing a two-stroke oil, it was invented, but not tested. And oils MC20, M8 should not be allowed close to a two-stroke engine if you like to drive. But if you do not give a lot of gas when riding a motorcycle, you can use these oils. How to determine what grabs a two-stroke engine
The first sign is that extraneous noise suddenly appears in the engine, a sign of the piston sticking, the engine loses speed. At such a moment, you need to release the gas and squeeze the clutch, if you manage to do it in time, then the piston will come out of this situation without damage.

In what proportion to dilute motorcycle oil
The instructions suggest the following ratio: for a run-in engine. 1/25, for a non-run-in. 1/20. There is no need to stupidly fulfill the proportions, everything will depend on how you step on the gas. If you do not take this into account, then during a quiet ride, diluted 1/20 gasoline will add candles, but if you drive hard and if you dilute gasoline 1/25, the engine will start to run at maximum speed, which will lead to piston breakage.

The two-stroke engine is designed in such a way that part of the oil can be trapped in the crankshaft and piston. When the gas is discharged to the fullest, the oil is strongly blown out from the piston, here you need a mixture of 1/20. How to dilute oil in gasoline to get 1/20? You need to take 10 liters of gasoline and half a liter of oil or 20 liters of gasoline and a liter of oil.

Why does a motorcycle spit oil through the muffler??
Everything is fine here, the motorcycle spits out excess oil from the muffler. Do not worry if you lightly pour oil into gasoline and the engine works fine. When the engine fills the candles, and the engine runs intermittently, then you need to reduce the amount of oil in the gasoline and add pure gasoline to the tank.

For two-stroke engines of motorcycles Tula, IZH Jupiter, IZH Planet, domestic motor oil M8V is well suited. For such motorcycles as Planet and IZH, the proportion for the mixture with a liter of gasoline is 25 grams per 1 liter of gasoline.

For the Tula motorcycle, you need to add a little more oil, 30 grams per liter of gasoline.

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Any cheap domestic engine oil is suitable for a mixture with gasoline. The most important thing is that the engine oil is not semi-synthetic and synthetic. There is no better oil than M8V for a mixture with gasoline, this engine oil is dark blue and very thick.

The main rule is that when mixing oil with gasoline, it is better to pour over than not to top up. If you do not add oil to gasoline, this will adversely affect the piston. This will cause the engine to overheat and jam.

When pouring engine oil into gasoline, there is a small problem. the acceleration dynamics of the motorcycle drops. In other words, when overflowing engine oil, the motorcycle will not quickly gain momentum, and the engine will smoke heavily. A lot of gray smoke will come out of the muffler. To prevent this from happening, you need to observe the proportions of the oil when you pour it into gasoline.

Action Calculating the amount of oil for the mixture

Many people are confused about this proportion and do not understand how much oil needs to be poured into the fuel.

This proportion is indicated not in mass, but in volumetric ratio. In addition, the proportions of each of the components are indicated in the ratio of oil to the amount of gasoline, and not to the total volume of the mixture.

For the oil in question with a ratio of 50 to 1 with a volume of 5 liters of gasoline, you need to take 100 ml of oil. And for 1 liter of gasoline. 20 ml of oil. If the ratio was 33 to 1 (3%), it would be necessary to take 30 ml of oil for 1 liter of gasoline, etc.

Consider a two-stroke engine with the designation f50 and f80.

In certain circles, these motors are gaining popularity.
They are made in China. They are mounted on the bike frame. This engine is an exact copy of the engine that was installed on the Riga moped and similar mopeds produced in the USSR.

The preparation of the mixture for such an engine is different and 2T oil is used (here is also mineral oil)

If the engine is running in, it is recommended to mix the oil in proportions of 1:20 (50 ml of oil per 1 liter of gasoline).
After running in, the proportion changes. It is necessary to reduce the amount of oil, to 25 ml per liter of gasoline 1:40.

Mixing recommendations.

Add the required amount of oil to the gasoline canister and shake

Action Oil selection

Oil for two-stroke engines has a combination of “2T” in the marking

The fuel mixture consists of gasoline and a special oil for two-stroke engines. You can buy oil from the same manufacturer that makes the motorcycle tool, but this is not essential.

The main criteria for choosing an oil: quality and price. The oil should not be cheap and the manufacturer should have a proven track record.

Also, on the package with oil, the proportion in which it should be mixed with gasoline is indicated.

For good quality oils, this proportion is 50 to 1.

This means using 50 parts gasoline and 1 part oil. This ratio is equivalent to 2%.

Quality standardization

Due to their specific properties, motor oils for motorcycles are tested according to their own standards, with the exception of oils intended for four-stroke dry clutch engines.

System of standards
AmericanPetroleumInstitute (API)
, which is most widely used in international practice, provides a separate group of quality classes for two-stroke engines. Of these, only API TC has retained its relevance, since the previous ones are recognized as insufficiently stringent for modern conditions, and the API TD, specially developed for outboard motors, was replaced by NMMA TC-W3.

takes into account the operating conditions of oil for motorcycles with a cylinder volume of up to 500 cm3, stipulating performance at high temperatures, carbon formation, the possibility of operating the engine at early ignition without damage.

Nevertheless, Japan, as one of the main manufacturers of motor vehicles, applies its own and more stringent standardization system. The smokiness of the oil during combustion is specially stipulated: for the first time the concept of low-smoke two-stroke oil appeared precisely after the adoption of the JASO FC standard. This quality class remains the most common at the moment, JASO FA products are allowed to be used only on obsolete engines in developing countries.

With the tightening of European environmental standards, the characteristics stipulated by the JASO FC standard ceased to meet the legislation. The developed ISO class system included the basic requirements of JASO (for example, the ISO-L-EGC standard is based on JASO FC), but additional requirements for engine cleanliness were introduced and smoke standards were tightened.

Flash point

This parameter characterizes the presence of low-boiling components in the lubricating composition, its value affects the volatility of the product during operation. For benign materials, this indicator ranges from 210-225 ° C.

In low-grade oils, mixtures with low viscosity quickly burn out and evaporate, which causes an increased resource consumption and a decrease in its temperature characteristics.

Let’s start with a HUSQVARNA chainsaw

The engine should be filled with 92 gasoline
Cannot be diluted with gasoline oil marked (TCW) it is intended for outboard motors with water cooling.
Mixing ratio of gasoline and oil
If you mix gasoline with Husqvarna branded oil, the proportion will be 2% oil per amount of gasoline or (1:50)

If you mix gasoline with non-branded oil with the designation JASO FB / ISO-L-EGB (according to the API classification, these oils are considered to be of low quality level.) Then the proportion will be 3% oil per amount of gasoline or (1:33)

R mixing tips
We fill the canister halfway, from the required amount of gasoline. Then add the required amount of oil and shake. After mixing, add the remaining amount of gasoline and shake again. The fuel mixture can now be poured into the tank. The shelf life of diluted gasoline is 30 days.


The main component of the fuel mixture for chainsaw engines is gasoline with an octane number of at least 92. Consumables with expired storage, made on the basis of gas condensate, having water and mechanical impurities in their volume are not suitable for fuel preparation.

  • The opinions of experts on the use of different brands of gasoline are ambiguous. On the one hand, the incomplete compliance of domestic gasoline A-92 with European standards is recognized.
  • On the other hand, the quality of A-95 gasoline is questioned due to the high content of anti-knock additives. You can use this fuel to prepare fuel for a chainsaw only if you are fully confident in its quality.
  • The difficulty lies in the presence of various improving additives, with the help of which unscrupulous manufacturers and distributors increase the performance properties of motor gasoline with a lower octane index.
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Also, irreversible changes in the working properties of the fuel occur when it is stored for a sufficiently long time in a plastic container, regardless of the level of its petrol and oil resistance.

Features of preparation and storage of the fuel mixture

Safety regulations prescribe to dilute gasoline and oil in a metal canister. This eliminates the risk of static electricity and fuel ignition.

Experts advise to pour oil into an incomplete container, mix thoroughly, and then top up with clean gasoline to the specified level. It should be excluded from everyday practice the saving of working time by preparing the working mixture directly in the gas tank of the chainsaw.

This technology is fraught with fuel system failures due to the ingress of a large amount of oil into the carburetor, the need for disassembly and thorough flushing.


Stricter criteria for the selection of the oil component. In the best variant, it is a mineral or semi-synthetic engine oil recommended by the manufacturer, intended for operation in high-speed two-stroke air-cooled internal combustion engines.

The advantage of mineral oils is their lower cost. Their more expensive semi-synthetic and synthetic counterparts are distinguished by improved performance and compliance with environmental standards.


  • maintain working properties in a wide range of operating temperatures;
  • do not form carbon deposits;
  • contain detergents, antioxidants, preservatives and other additives useful for the operation of the power unit.

Benefits of branded oils

Many domestic and foreign manufacturers specialize in the production of special motor oils, but the highest rating indicators are for branded products Stihl, Husqvarna and Makita.

Only in certain parameters are the domestic motor oils of the Lukoil trademark inferior to the branded assortment.

The list of advantages of branded motor oils:

  • economical consumption;
  • stability of performance under difficult operating conditions and during long-term storage;
  • minimum amount of toxic compounds in exhaust gases;
  • almost complete absence of carbon deposits.

According to the American classification, API-TB oils can be used for work in household and professional models. The Japanese counterpart is JASO-FB and JASO FD. Preparation of a combustible mixture using oil for 4-stroke engines is strictly excluded.

Red, green or any other color of oil determines the product’s belonging to the assortment of a certain manufacturer, therefore, when determining the characteristics of the material, it is not taken into account. You should be extremely careful when choosing engine oil of unknown composition and origin.

Until you receive additional information about the quality and operational parameters, it is better to temporarily refuse to use such material.

It is allowed to mix engine oils of the same type in composition and purpose, produced by brands known for the quality of their assortment. Under no circumstances is it allowed to mix mineral and synthetic oils.

Caution. fake!

Small private companies from China and other Asian countries specialize in the production of motor oils, which are sold at a lower cost in the markets under the trademarks of leading manufacturers.

  • The characteristics of counterfeit products are an order of magnitude lower than the original ones. The constant use of counterfeit products adversely affects the operation of the chainsaw and the durability of its operation.
  • Only an experienced specialist can determine the status and quality of the oil, so you can avoid possible risks by buying consumable components in a network of branded and licensed retail outlets.
  • The use of substandard lubricants for service specialists is a legal basis for depriving the owner of a faulty saw of warranty repair and restoration obligations.

Measuring containers

To maintain the correct proportion of gasoline and oil, the calculation table printed on the saw body can be used. Branded containers of leading manufacturers of motor oils are equipped with built-in measuring devices that ensure accurate dosage of oil for different volumes of fuel mixture.

Volumetric utensils are included in the factory kit of many models of budget chainsaws. In some cases, a 20 cm3 medical syringe will help to dilute gasoline with oil in a given proportion.

Storage advice

It is better to prepare the mixture in an amount that should be enough to perform one-time work. The problem lies in the irreversible deterioration of the working properties of the mixture during storage. The finished composition is recommended to be used over the next few days.

A mixture of gasoline with a month-old oil impairs the traction capabilities of the engine. There is also the formation of resinous compounds in the fuel system and intense carbon formation in the combustion chamber, loss of mobility of the piston rings.

  • With minimal damage to quality, it is advisable to store gasoline with oil for no more than 2 weeks. At an ambient temperature of 25 degrees or more, this period is reduced to 8-10 days.
  • In order to save money, the expired mixture can be gradually consumed by mixing it into the fresh composition in an amount of no more than 10% of the total volume.

In order to avoid problems associated with the failure of the fuel system, it is recommended to filter the prepared mixture through a non-fiber material such as suede, or a fine-mesh twill weave, a metal mesh.