How to dilute gasoline correctly for a grass trimmer

How much oil to put in the trimmer for the grass per liter of gasoline

Gasoline mowers are fairly common tools used by garden and homestead owners for mowing grass and making hay. common tool names are the terms “grass trimmer” and “lawn mower. The main difference is hidden in the design of the motor. the expensive segment of the devices is equipped with four-stroke models, and the cheapest. two-stroke. The latter option has advantages, including a small weight, ease of use, as well as a low cost.

The most important condition for the work of two-stroke models is the preparation of the fuel mixture, based on the manufacturer’s defined proportion of gasoline and oil. The simplified design of the motor does not provide a separate channel for lubrication, so engine oil is added directly to the gasoline. If the right gasoline ratio is not observed, it can lead to a considerable drop in tool life and even to tool breakage. Let’s understand what composition is required for gasoline trimmers, how to properly prepare the mixture and what it can affect.

The choice of gasoline for grass trimmer

For some reason, everyone prefers to choose a brand of gasoline for brushcutter at his discretion. This is an erroneous approach, because, first of all, it is necessary to carefully study the instruction manual, where the manufacturer’s recommendations on the choice of fuel type are given. But this is not a guarantee either, because unleaded fuel may be sold under different brands (which differ in many manufacturers), with significantly different composition. Therefore, it is necessary to be guided by the main characteristics in order to choose gasoline for a particular model of grass trimmer.

Manufacturers of gasoline tool manufacturers recommend using gasoline brand AI-92, but for more expensive types will need fuel with a higher octane number. AI-95. Any brand with the number 90 or less in its label is not suitable for gasoline scissors, because it leads to rapid wear and tear. The problem is because of unscrupulous fuel producers who sell a completely different brand under the guise of 92. The situation is as follows:

  • In the passport on the gasoline equipment is a recommendation to use gasoline with an octane number not lower than 92;
  • The conscientious owner goes to the gas station, where the lowest price and with a clear conscience pours such fuel in the brushcutter;
  • As a result, the service life is reduced, because AI-80 and AI-76 are often sold under the guise of AI-92.


To avoid such a situation, you need to choose one filling station, which sells proven gasoline (it can be determined by the reviews of regular customers). It is also important where to fill up the fuel after purchase. only metal containers should be used (plastic is prohibited).

Preferably, when it is possible to buy gasoline for grass trimmer high purity specifically for garden equipment. Then you can be sure of its quality and protection against fakes.

Which oil to choose to fill your grass trimmer or types of lubricants

Grass trimmers and lawnmowers work from two-stroke engines, which have a simplified design. Rarely, but there are models of trimmers with 4-stroke engines, which run on pure gasoline. Power units of two-stroke type do not have a compartment for pouring engine oil (oil sump), due to which the weight of the tool decreases and their cost decreases. If the rotating parts of the motor are not lubricated, they will end up failing quickly. To prevent this, the grass trimmer is not filled with pure gasoline, but with a mixture of oil. What oil to dilute with gasoline for grass trimmer?

To begin with, let’s remember or find out what types of oils by chemical composition are available:

  • Mineral fluids. these are intended for low power, air-cooled machinery. This is the cheapest type of lubricant for motors
  • Semi-synthetics. they are for air- and water-cooled machinery
  • Synthetic. suitable for all engine types with different types of cooling. They do not require frequent changes, and this type of lubricant is several times more expensive than mineral and semi-synthetic

From the above it follows that the grass trimmer is suitable for oil with any composition. mineral, synthetic and semi-synthetic. Oils with different chemical composition differs in price, so it is necessary to rely on the recommendations of the manufacturer of the tool when buying. The manual provides recommendations on what types of oil are best to use. If it is a standard TC-W3, then it is not so important what composition the substance should have. In this case, you can dilute mineral, semi-synthetic and synthetic with gasoline.

This is interesting! The main thing when choosing an oil is not to get caught on a fake, as today you can very often find different types of lubricating compositions for two-stroke engines, which consist mainly of low-quality petroleum products.

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Features of filling brushcutters

Depending on the engine, brushcutters are divided into two-stroke and four-stroke engines. In the first case, the piston in the internal combustion engine makes 2 moves per working cycle, and in the second case. 4 moves. Differences in the working principle of the engine and cause different approaches to refueling trimmer for grass.

2-stroke engine for brushcutters

As a rule, a two-stroke engine is used in ordinary brushcutter models. Lawn trimmers do not need very high power and sharpness, so it is quite suitable for the task at hand. This engine is also much cheaper and simpler. but it is topped up with a fuel mix of oil and petrol. Such fuel is poured into the carburetor and fed into the cylinder in the form of an oil-and-gasoline mist. The oil is thereby used to lubricate all the necessary parts. But the combustion of the mixture is accompanied by a caustic smell and smoke, which increases the toxicity of the exhaust gases.

Important! For this kind of brushcutter you need a special oil for two-stroke engines that burns completely without leaving any residue and that has a low volatility. The engine also has 20% solvent in it to mix well with petrol.

Fueling your brushcutter with a four-stroke engine

Four-stroke engines are used in professional brushcutter models. They have great power and can work for long periods without stopping or refuelling. They are powered by gasoline and oil, but fill different tanks. That means it doesn’t play a part in the combustion process. The exhaust fumes are less toxic.

Side note! The engine of a brushcutter with a four-stroke engine is more economical than a four-stroke. They use much less fuel: savings up to 50% for gasoline and 80% for oil.

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The brushcutter is easy to fill

Depending on engine setup, brushcutters are categorized as two-stroke and four-stroke. The first cycle has two strokes for the combustion engine piston and the second cycle has four strokes. Differences in engine operating principle lead to different approaches to filling the weed trimmer.

Fueling a brushcutter with a two-stroke engine

The engine of a conventional brushcutter is usually a two-stroke engine. The lawnmower does not need a lot of power or speed, so it is well suited for the task at hand. Also, this engine is much cheaper and simpler, but it is fueled by a fuel mixture consisting of oil and gasoline. This fuel is fed to the carburettor and to the cylinder as a petrol-oil mist. The oil thus lubricates all necessary parts, and combusts together with the petrol when the engine is running. The engine exhaust emissions are the result of a strong smell and fumes, but the mixture burns badly, increasing the toxicity of the exhaust.

Important! For such brushcutter it is necessary to use a special oil for two-stroke engines, which completely burns up, leaving no char, and has a low volatility. And to mix well with gasoline, it’s 20% solvent.

Fueling your brushcutter with a four-stroke engine

Four-stroke engines are used in professional brushcutter models. They have great power and can run for a long time without stopping or refuelling. They also use gasoline and oil as fuels, but they are filled into separate tanks. This means that oil is not part of the combustion process, so the exhaust fumes are not as toxic.

Also note! In addition to better environmental performance and less heat, four-stroke brushcutter engines are also more economical. They use much less fuel. savings are up to 50% for gasoline and up to 80% for oil.

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Oil requirements

The gasoline-oil mix you choose for your brushcutter must comply with the prescribed specifications. It is important to note that domestic manufacturers often label their products slightly differently than the American or Japanese classification. Russian producers of lubricants, as a rule, put marking 2T on all oils designed for two-stroke engines. Often you can find oil cans with the labels “self-mix” or “pre-mix” on the shelves of stores. In the first case, it means that the oil does not require any additional manipulations, just pour the gasoline and oil into one container, and mixing will occur without human intervention. In the second case, respectively, it is necessary to shake or shake the mixture to bring it to the desired consistency.

As one can see, the existence of different classifications of lubricants suggests that it is necessary to use oils in two-stroke engines. This is due to the fact that the fuel mixture without lubricant fairly quickly put the engine out of operation, which will not be lubricated properly. Gasoline and oil create the necessary environment that reduces detonation, removes unnecessary waste (waste products from gasoline combustion) and protects the engine interior from wear.

It is important to remember that using oil of the wrong classification can cause damage or clogging of the motor. Of course, it can be repaired, but in order to prevent possible breakdowns, and to minimize their probability, it will be better to study the instruction manual, find out the volume of the two-stroke engine installed on the brushcutter, and use only gasoline and oil that will suit this model by all parameters.

Quite often, in the recommendations section (and sometimes on the label), the manufacturer indicates the partner companies whose gasoline and oil it recommends to fill its models. Most often, fuel and lubricant recommended by the manufacturer will work best for the grass trimmer.

First of all, you should immediately exclude all oils of unknown (garage, basement) origin from the list of actively used lubricants. Usually it is not easy to dilute these oils because the base, composition and viscosity are very unclear. As a rule, the labels of non-brand producers are not very informative and only provide general information. It is highly not recommended to dilute and dilute oils such as AC-10 and ACZp-10. The origin of these lubricants is usually quite obscure, it is better to give preference to the proven brands that are used by thousands of people around the country every day.

A distinctive feature of all oils for two-stroke engines is the fact that the manufacturers paint them in a color that contrasts with gasoline. The fluid is semi-transparent, viscous in consistency, slightly yellowish, but not dense. Usually we are talking about three colors. red, green and blue.

Do not forget that the color scheme has no effect on the classification (as is often the case with antifreeze).

You should never use oils that are not designed for grass trimmers. This can be extremely detrimental to the operation of the power unit, leading to increased fuel consumption, fouling of the spark plugs and a whole range of other problems that will have to be detected and eliminated. It should be noted that if the fact of using oil that is not included in the tolerance is established, the seller has every right to remove the machine from the warranty. It means that you will have to replace the defective parts at your own expense, and no exceptions will help.

If the fluid you have purchased is not of the quality you claim (e.g. too thin), you should never mix it with gasoline. It will be best to return such oil back to the store, explaining to the seller the reason for return.

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Stricter criteria for selecting an oil component. The best option is a manufacturer-recommended mineral or semi-synthetic motor oil designed for high-speed, air-cooled two-stroke engines.

The advantage of mineral oils is their lower cost. Their more expensive semi-synthetic and synthetic analogues favorably differ with improved performance characteristics and compliance with environmental standards.

  • retain performance over a wide range of operating temperatures;
  • do not form deposits;
  • contain detergent, antioxidant, preservative and other additives useful for power unit operation.

What oil to choose

For effective operation of the grass trimmer it is necessary to select oil for two-stroke engines. This is due to the lack of an oil sump in such a device. Depending on the chemical composition of the oil the following classification is distinguished:

  • Mineral. based on petroleum distillate, suitable for low-power machinery and with air type cooling, but requires frequent replacement and can only be used in good weather during the warm season;
  • semi-synthetic. suitable for garden equipment with air and liquid type of cooling;
  • synthetic. based on esters, they do not require frequent changes and can be used at any time of the year.

Oil for 2-stroke engines is characterized by good solubility and the feature of complete combustion. For the grass trimmer, it is recommended to use a lubricant that is suitable for devices with an air-cooled system. Most often the packaging indicates that the oil is intended for garden equipment and is labeled TA, TV or TC. And the latter is the most preferred.

Often manufacturers of chain saws produce a suitable oil, so you can make the choice easier by selecting a fluid of the appropriate brand.

Figuring out which gasoline to buy: AI-92 or AI-95

As many people, as many opinions, which applies not only to the choice of trimmer oil for grass, but also gasoline. Similarly, in order not to make a wrong choice, it is recommended to use gasoline of the brand recommended by the manufacturer (indicated in the instruction manual of the tool). But everything is not so simple here, because at every gas station gasoline brands only have the same name, but have completely different composition. Need to understand, and come to a single conclusion about what brand better to fill the gasoline in a two-stroke engine for your trimmer for grass.

Manufacturers recommend using for their equipment gasoline A-92, and some models require the use of brand A-95, which does not contain ethanol. Use gasoline AI-90 and below is not recommended, as they will entail rapid deterioration of the engine parts. Buying gasoline of one brand, you can not be 100% sure that it corresponds to reality. As a result, we get the following picture:

  • The manufacturer recommends to fill the fuel in the grass trimmer of AI-92 brand
  • The gardener uses only this brand of gasoline, but buys it at gas stations where the price is lower or where he has to
  • This negatively affects the internal parts of the motor, as at one gas station. it is really high quality gasoline AI-92, and at the second. at best if it is AI-80, not AI-76

As a result, the engine suffers, and after a couple of years of operation of the new trimmer for grass necessitates its overhaul. To not have to analyze the quality of fuel or buy only expensive gasoline, it is recommended to fill only one filling station. Gas stations fill gasoline only in metal canisters, not plastic canisters.

There are manufacturers that produce special purified fuel for two-stroke engines. If this option is chosen, then you won’t need to choose the best gas station, brand of gasoline and monitor its shelf life.

Conclusion on the choice of gasoline for grass trimmer!

In the trimmer for grass to fill the gasoline brand that is recommended by the manufacturer. If you pour gasoline A-95 into the trimmer’s tank for grass, instead of A-92 (which is recommended by the manufacturer), the engine will warm up faster and work unstably. It is also better to choose gasoline A-92 Ecto, which has improved characteristics in terms of environmental friendliness.


It remains to choose what gasoline to fill in the trimmer for grass. The choice is not great. AI-92 and AI-95. The difference between them is quite significant. If the manufacturer’s instructions do not specify what gasoline to use, you must stop at AI-92. It almost does not depend on the brand of gasoline, how much oil per liter of gasoline should be added, if the fuel is of high quality and fully complies with the declared brand. Buy petrol only at the branded filling station, there the risk to buy A-80 instead of AI-92 is practically equal to zero.

If it is recommended to use AI-95, do not use other brands of gasoline. If the engine starts, it will run irregularly and overheat quickly. So you run the risk of damaging the motor not only the domestic trimmer for grass, but also the professional one.


It remains to choose what gasoline to fill in the trimmer for the grass. The choice is limited to AI-92 and AI-95. The difference between them is quite significant. If the manufacturer’s instructions do not specify what gasoline to use, you must stop at the AI-92. It almost does not depend on the brand of gasoline, how much oil to add per liter of gasoline, if the fuel is of high quality and fully complies with the stated brand. Buy gasoline only at brand gas stations, where the risk of buying A-80 instead of AI-92 is almost zero.

If it is recommended to fill Ai-95, then do not use other brands of gasoline. If the engine starts, it will run irregularly and overheat quickly. So you risk disabling the motor not only the domestic trimmer for grass, but also the professional one.

How to dilute petrol with oil for a grass trimmer if you under or overfill the oil

If you bought a trimmer for the grass, lawnmower, brush cutter, chainsaw and other types of equipment, you probably know that as the power units on them are used two-stroke motors. These engines do not run on pure gasoline, like four-stroke engines, but on a mixture of gasoline and oil. In what proportion should you dilute gasoline with oil for grass trimmer. this is the question every dacha owner asks himself before preparing the tool for work. In this issue, let’s understand in detail, as the dilution of gasoline with oil for grass trimmer affects the service life of the tool, and improper preparation of the mixture, will lead to rapid engine wear. What is the danger of too much or not enough oil in the gasoline for the grass trimmer:

  • If the petrol is diluted with a lot of oil (above the norm) it will lead not only to a large amount of smoke, but also to the formation of carbon deposits on the cylinder walls and a decrease in power.This fouling will cause the piston to wear out, which will be diagnosed by a decrease in performance
  • If the gasoline does not contain enough oil in the grass trimmer, it is even more dangerous.After all, the working mechanisms of the engine will not be lubricated in sufficient quantity, which will eventually lead to their rapid wear (there is a rapid destruction of piston rings and jamming of the engine). If the amount of oil in the gasoline in the grass trimmer is insufficient, the wear and tear of the motor will occur ten times faster

In order not to pay for mistakes at the cost of an engine overhaul or buying a new tool, you need to fill the tank with fuel of the correct consistency from the first day. You can find out the ratio in the instruction manual of the tool, because different manufacturers’ models may give different recommendations. Usually this ratio is as follows:

  • 1 to 25, or 40 grams of 2-stroke oil for 1 liter of petrol
  • 1 to 40 or per 1 liter of gasoline 25-30 grams of lubricant
  • 1 to 50 means 20 grams of oil is added to a liter of gasoline

The standard value is 1 to 50 (it is indicated on canisters with oil for two-stroke engines), but one has to rely on it as a last resort, because the manufacturers indicate the recommended proportion value, and if it is not observed, the operational resource of the two-stroke motor is reduced.

In addition to observing the proportion, it is also necessary to learn how to prepare the mixture. After all, the option of adding oil to the gas tank, is categorically contraindicated, although some do so. If you bought a grass trimmer or lawnmower, you’ll need the consumables you’ll use to make the mixture. Instructions for preparing the fuel mixture in the grass trimmer is as follows:

  • Prepare gasoline and two-stroke oil based on the above recommendations for lubricant and fuel selection
  • To prepare the mixture, it is also necessary to take a container or a container. Usually a plastic bottle is used for this purpose, which should be chosen accordingly. It needs to be clean on the inside. It is not recommended to use a container from milk, beer or other drinks. A mineral water bottle is best
  • It is very important that the container has a whole value of volume, that is, 1 or 2 liters, so that you don’t have to calculate how much to pour oil in a bottle of 1.5 liter, 1.3 or 1.25 liters, because you can easily make a mistake
  • You also need a syringe, which is used as a measuring tool for dosing the oil. For such purposes an ordinary medical syringe of 10cc or more is suitable. It is desirable to have a precise measuring scale on the syringe
  • After the necessary materials have been prepared, you can proceed with the preparation

Instructions for preparing the fuel mixture into the lawnmower:

    First, you should fill the plastic container. Fill the container two fingers under, so that the oil can fit in

After preparing the fuel mixture for the grass trimmer, it remains to refuel the tool, and start working. How to properly fuel grass trimmers, lawnmowers, chainsaws and other types of motor equipment, let’s consider in detail.

ДOnly fresh gasoline is used in the trimmer.

Consequences of the ratio violation

How accurately you follow the manufacturer’s recommended proportions of “oil-gasoline” mixture depends on the service life of the engine of the brushcutter. The fact is that the fuel mixture enters the cylinders in the form of petrol and oil mist. And the task of the oil composition is to lubricate the moving and friction parts and surfaces of a variety of parts that are in the cylinder. If it turns out that you don’t get enough oil or that there is no oil at all, the parts that are in contact will dry out and damage each other. This results in scoring, scratches and chips, which will certainly lead to complete or partial engine failure (for example, it can jam).

If, on the contrary, there is too much oil in the engine, it has no time to be completely burnt out and deposited on the cylinder walls turning into solid particles like coke, slag and the like with time. As you can guess, this also leads to engine failure. The most important thing that should not be allowed is even a single abuse of the proportions in the direction of the lack of oil. It’s better to overfill a little oil 10 times than to underfill just once. It often happens that this time is quite enough to break the engine.

How to choose for a lawnmower?

For two-stroke brushcutter engines use gasoline brands AI-92 or AI-95. Most often. the first of the named. This information can be found in the data sheet of the machine. If, for some reason you do not know exactly on what gasoline trimmer for grass should work, you can pick up by testing both brands of gasoline in action. It will not cause any global changes in the engine, but it is quite possible to determine which gasoline a particular model “likes” more, judging by a number of factors. This will be indicated by the developed power, injectivity, engine heat and its stable operation at all engine speeds.

But it is much more difficult to determine the proportions of oil to a certain volume of gasoline. In this case, you need to know at least something about the manufacturer of the equipment. And by the standard proportions for this manufacturer choose the proportion for a specific model, taking into account the type of oil.

You can even start selecting by country of production.

For example, for Chinese low-power trimmers, mainly two ratios are used. 1: 25 or 1: 32. The first one is for mineral oils and the second one is for synthetic oils. About the choice of standard proportions for European and American manufacturers of petrol trimmers in connection with the type of oil, we have already told earlier. According to the oil class for household trimmers you should use oil TV by API classification. For more powerful trimmers. TC oil grade.

About what ratio of petrol and oil is necessary for a lawn trimmer, see the following video.

Grass trimmer, or lawnmower. a tool you can’t do without in the household. At the same time, its reliability, efficiency and long service life depend on many factors. For example, the quality of fuel. This means that you need to choose the right oil for the grass trimmer, observe the proportions when adding it to gasoline and the rules of filling the device.

Husqvarna oils

Lubricants increase the life of the engine and indirect parts, provides long, trouble-free operation.

Husqvarna all-season oil is one of the best for garden and construction equipment. Protects the engine immediately at start-up and instantly lubricates the far-flung parts of the structure. Characterized by soft texture, anti-corrosive properties, works in a wide range of temperatures and at high speeds.

The benefits of Husqvarna oils

  • Suitable for use with low-quality gasoline;
  • contribute to economical fuel consumption;
  • A thick film of oil protects the engine from wear and corrosion;
  • reduces the appearance of carbon deposits on pistons and cylinders;
  • Due to its high viscosity the oil gets to the parts that rub against each other easily;
  • special additives prevent deposits in the crankcase;
  • Reduced maintenance costs;
  • low volatility, resistance to oxidation processes;
  • environmentally friendly and biodegradable components.

Engine oils for 2 and 4-stroke engines

  • snow blowers;
  • chainsaws and chain saws;
  • lawn mowers;
  • trimmers;
  • blowers;
  • power tillers;
  • lawn mowers; garden tractors, etc.

Summer oils and universal variants for year-round use are available.

HP Husqvarna 1 liter API SG class 2-stroke oil is the sales leader in Russia. Its improved formula is adapted for work in severe latitudes of Russia with poor-quality gasoline. Synthetic additives protect the engine from wear, deposits and corrosion, suitable for all 2-stroke engines.

Please note! How to distinguish Husqvarna oil from counterfeit:

  • HP two-stroke oil is sold in 1 liter only, price. from 799 rubles.
  • Laser engraving on the top of the bottle in black or yellow.
  • Graduations are marked with 100 ml dots on the side to indicate oil level.
  • Date of manufacture includes not only day-month-year, but also time of manufacture.
  • Instruction manual on back, entirely in Russian. There is information on certification, precautions, storage conditions, factory and importer in
  • In addition to the logo and barcode there is type number # 5878085-12.
  • Marking “Made in Sweden”, no other official manufacturer.
  • The dial on the bottom of the bottle: The year is indicated in the center of the circle and the arrow points to the month.
  • Tamper-evident ring, H (Husqvarna) logo engraved on lid, with protective aluminum foil underneath.

Husqvarna chain oils

To prevent wear, a special low-viscosity oil is used to lubricate the chain and protect the saw bar. Effective in cold and wet conditions. Easy to wash off with soap and detergents.

Air filter oil

Impregnates the filter and collects dust particles before they get into the engine, thus increasing its life span and durability. Removable with soap, biodegradable.

See the complete engine oil catalog in our Husqvarna store.

  • Free same day delivery in Moscow.
  • Self-delivery. Moscow. Moscow, metro station Tulskaya, str. Pavlovskaya 27/29.
  • Sending by transport company to any region

To buy Husqvarna oil place your order online or call us if you want to speak to an expert.

Choosing lawnmower oil

For trimmer engines choose air-cooled 2T oils, which are used in engines with displacement from 50 to 200 cm3. The first thing to pay attention to when buying oil is not the price but the protective properties of the material, because small savings can later become a real headache for the owner and, as a rule, a big expense.

Two-stroke oil for lawnmowers

The main factor that determines the quality of the oil for grass trimmer, is the alkali number. This component prevents oxidation of rubbing parts and slows down their degradation. the oil gradually loses its alkalinity and becomes oxidised during use. Optimal level of acidity (Ph) should not be less than 8-9 units.

The brushcutter oil viscosity also has a big influence on how the petrol tool works. This determines whether the grass trimmer can be operated at different temperatures. For example, summer types of lubricants become thick even if the temperature falls slightly. Since you only use your lawnmower in the spring and autumn, summer grade oil is the right choice.

The flash point of grass trimmer oil must be above 225C, otherwise the oil will burn out quickly and the piston group will be subjected to intensive wear and tear.

What to look for when choosing oil?

Modern two-stroke brushcutter engines are filled with a mix of AI-92 gasoline and oil marked “2T”. Use of fuel with a higher octane number will help increase the flash point and, consequently, the burnout of the lubricant.

Varieties of STIHL oils

Undoubtedly, the best oil for the trimmer for grass is the one recommended by the manufacturer, but the owner does not always have the opportunity to buy exactly “branded” lubricant. Experts recommend Shell Helix Ultra, based on Pureplus technology, which improves the basic properties of the lubricant.

STIHL HP Ultra, STIHL HP, STIHL HP S oils should be used for gasoline trimmers from the German manufacturer STIHL. A budget substitute can be products of the company Vityaz, which by its properties is most similar to the recommended material.