How much oil to pour into the gasoline for the lawnmower

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

Gasoline mowers. quite common tools, used by owners of garden and homestead farms for mowing grass and making hay. common names of tools are the terms “grass trimmer” and “lawnmower“. 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 cheap ones are two-stroke. The latter option has advantages, including low weight, ease of use, as well as low cost.

The most important condition for two-stroke models is the preparation of the fuel mixture, based on the manufacturer’s defined proportion of gasoline and oil. Simplified design of engine does not have a separate channel for lubrication, so engine oil is added directly to petrol. Violation of the correct proportions leads to a significant reduction in tool life and even to its failure. Let’s understand what composition is required for gasoline trimmers, how to properly prepare the mixture and what it can affect.

Choice of gasoline for grass trimmer

For some reason everyone prefers to choose a brand of gasoline for brushcutter at his discretion. This is a wrong approach, because, first of all, you should carefully study the instructions, where the manufacturer’s recommendations are given for the selection of the type of fuel. But this is also not a guarantee, because unleaded fuel can be sold under different brands (which differ in many manufacturers), significantly different in composition. Therefore, it is necessary to be guided by the basic characteristics in order to choose gasoline for a particular model of grass trimmer.

Manufacturers of gasoline tool manufacturers recommend using gasoline brand AI-92 for work, but for more expensive types will need fuel with a higher octane number. AI-95. Any brands that have the number 90 or less in the marking are not suitable for benzocoskos, as they lead to rapid wear and tear. The problem is caused by unscrupulous fuel producers who sell a completely different brand under the guise of 92. The situation is as follows:

  • In the passport of gasoline equipment there 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 is and with a clear conscience pours that fuel into the brushcutter;
  • As a result, service life is reduced, because AI-80 and AI-76 are often sold as AI-92.


To avoid this situation, it is necessary to choose a filling station, which sells proven gasoline (this can be determined by the reviews of regular customers). It is also important where to pour fuel after purchase. only metal containers should be used for this (plastic. 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 counterfeiting.

Types of brushcutters

Now on liquid profile commercial sites a large selection of devices for mowing grass, small bushes. For example, lawn mowers with electronic engine are available with gasoline engines. DO NOT make brushcutters with a diesel engine, because they have a low revolution speed.

Liquid statistics show the advantage of brushcutters with internal combustion engines over their electronic counterparts. Electric brushcutter is used in places where there is a stationary electronic network.

Oil requirements

The gasoline-oil mix you choose for your brushcutter must comply with the recommendation in the instruction manual. It is important to note that domestic manufacturers often label their products slightly differently from the American or Japanese classification. Russian manufacturers of lubricant products, as a rule, put the marking 2T on all oils intended for two-stroke engines. Often you can find oil cans on the shelves that have a “o” or “pre mix” on them. In the first case, it means that the oil does not require any additional manipulation, just pour the gasoline and oil into one container, and mixing will occur without human intervention. In the second case, accordingly, it is necessary to shake or shake the mixture to bring it to the proper consistency.

As you can see, the existence of different classifications of lubricants suggests that the use of oils in two-stroke engines is necessary. This is due to the fact that the fuel mixture without lubricant pretty quickly knock out the engine, which will not be lubricated properly. Gasoline and oil form the necessary fluid which reduces detonation, removes superfluous waste (waste products from gasoline combustion) and protects the inside of the engine from wear.

It is important to remember that if you use the wrong oil classification, engine damage or clogging can occur. Of course, it can be repaired, but in order to prevent possible breakdowns, and to reduce their probability to a minimum, it will be better to study the instruction manual, learn the volume of the two-stroke engine installed on the brushcutter, and use only gasoline and oil, which will fit all the parameters of this model.

Quite often in the recommendations section (and sometimes on the label), the manufacturer indicates the partner companies, which gasoline and oil he recommends to fill in their models. often than not, the fuel and lubricant recommended by the manufacturer will suit the grass trimmer best.

First of all, you should immediately exclude from the list of actively used lubricants all oils of unknown (garage, basement) origin. Usually it is not easy to dilute such oils because of the unclear basis, composition. As a rule, the labels of non-branded manufacturers are not replete with information, covering only general information, without elaboration. It is highly discouraged to dilute and dilute oils such as AC-10 and ACZp-10. The origin of these lubricants is usually quite vague, it is better to give preference to proven brands that are used every day by thousands of people around the country.

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

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

Under no circumstances should you use oils from a line not designed for grass trimmer. This can have an extremely negative effect on the operation of the power unit, leading to increased fuel consumption, fouling of spark plugs and a variety of other problems that will have to be identified and eliminated. It should be noted that if the fact of using oil that is not in the tolerance is established, the seller has every right to remove the machine from the warranty. This means that you will have to replace the failed parts at your own expense, and no exceptions will not help here.

If the fluid purchased does not have the declared qualities (e.g., too liquid), 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.

How to dilute gasoline and oil for a grass trimmer for refueling

The two-stroke engines of the tool are powered by a petrol-oil mixture which is prepared in the proportions given in the machine’s data sheet. If you ignore the rules of mixing, the garden tool can quickly break down.

The functioning of the two-stroke unit is different from that of the four-stroke engines: the lubrication of the rubbing surfaces in the crankshaft and other parts of the unit is not done from the crankcase, but through oil that has been previously diluted with gasoline. For two-stroke engines there is a general rule for the preparation of the combustible mixture. gasoline is diluted with a certain volume of oil intended for this purpose.

How to dilute petrol with oil for grass trimmer. step-by-step instructions

The fuel must be mixed in specific proportions.

If the fuel mix is mixed with too little lubricant, the lawnmower will wear out quickly

The optimal ratio of oil to gasoline can be found in the trimmer manual. As a rule, it is 1:50, 1:40 or 1:25.

Dilute gasoline with a lubricating component must first be in a suitable container: doing it immediately in the fuel tank is prohibited. If you ignore this rule, the work of the motor can be inconsistent, due to which the tool will quickly fail. To dilute the fuel mixture, you should not use plastic canisters or bottles, as gasoline is capable of dissolving this synthetic material. Order of mixing fuel:

  • Pour a liter of gasoline into a container (a metal canister is best).
  • Add half of the required oil proportion.
  • Stir the liquids thoroughly, away from open flames.
  • Pour the rest of the lubricant into the container and stir the mixture again.
  • Pour the fuel into the trimmer’s fuel tank.

Wear a respirator and rubber gloves when carrying out this work. You may use a watering can for easy pouring. The ready mixture should not be stored for longer than 3 months, it is better to dilute exactly as much fuel as you need for the planned work in the near future. Always choose high quality oil for mixing with gasoline, buy it at a certified gas station.

Proportions of oils and fuel

Calculation of the ratio of ingredients for preparing the grass trimmer dressing should take into account the recommendations on the oil package. The standard proportion is 1:50. Any quality oil for two-stroke engines can be used.

Choosing lawnmower oil. helpful hints from the pros

If the manual to the tool has been lost, and there are difficulties in choosing a suitable oil, then it is recommended to choose the following two options:

  • Semi-synthetic: cheaper than synthetic, but more expensive than mineral. They are suitable for Russian and foreign machines. They have low smoke parameters and take proper “care” of the engine’s structural elements. Produced through distillation of petroleum products and hydrocarbons
  • Synthetic. expensive types of lubricants that are suitable for all types of machinery. If you use synthetics for your grass trimmer, the tool engine will run like clockwork

When selecting and buying oils to dilute with gasoline, you may be confronted with the fact that some letter designations are indicated on the canisters. These designations. API classification, which will be useful to know who wants to fill in the tool suitable to the parameters of the lubricant. Let’s look at all types of oils by API classification for two-stroke engines:

  • TA. designed for air-cooled appliances up to 50 cm3. Such equipment includes mopeds, lawnmowers, grass trimmers and brushcutters. The optimal solution for lawnmowers and grass trimmers
  • TB. used for filling the engines of machines such as mopeds, chainsaws, scooters and motorcycles. Engine displacements of such equipment range from 50 to 200 cm3. Also suitable for trimmers
  • TC. designed for diluting with gasoline and pouring into motorcycles, snowmobiles and other types of land vehicles
  • TD. designed for boat motors, jet skis, and speedboats

API classification is an American standard that is used in Europe. However, there are additional designations on canisters of two-stroke motor oils, such as FA, FB, FC, FD and others when choosing. These are the classification of oils by smoke emissions, which is developed by the Japanese standard JASO. If you meet such designations on the selected oils for trimmers and chain saws, then you should take into account their deciphering:

  • FA are used in the countries, which provide for the law minimum emission of smoke into the atmosphere. Makes imperceptible fog when running
  • FB. designed for use in countries with strict restrictions on smoke emissions. Virtually do not emit white smoke
  • FC. smoke is emitted transparent to the atmosphere and is not visible to humans
  • FD. smokeless types of oils for 2-stroke engines, which do not emit smoke, but still have improved chemical properties. They are usually used for mixing with gasoline and filling boats, boats and yachts

If there is a designation “self-mix” and “pre-mix” on a container with the lubricant, it means self-mixing with gasoline (the first option, which does not require shaking), and the need for forced dissolution (the second option).

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This is interesting!Oils for two-stroke engines are marked with 2T. Knowing the classification of oils by their type, it will not be difficult to choose the best option for your brand of lawnmower. There are many brands of oils for two-stroke engines on the market, but it is better to pay special attention to the following companies:

  • STIHL. they make mineral and synthetic oils, while the semi-synthetic ones are rare
  • Shell Helix Ultra, recommended by specialists
  • Motul
  • Oleo-Mac
  • Echo
  • Hammerflex
  • Lukoil is a Russian oil that is three times cheaper than its foreign analogues, but has excellent quality parameters

The of the products are not specified, because their cost varies. There are many other brands, and if you still want to find the perfect lubricant for your grass trimmer, it is recommended to watch the test in the video clip below.

From the video you can conclude that it is not always useful to buy expensive oils, because they can be of poor quality, as seen in the real example.

For a brushcutter, grass trimmer or lawnmower, it is best to choose a synthetic or semi-synthetic oil labeled TA or TB. Take into account the manufacturer’s recommendations, as some manufacturers of quality equipment may recommend using only synthetic lubricants.

We deal with the choice of gasoline for the lawnmower AI-92 or AI-95

So many people, so many opinions, which applies not only to the choice of oil for grass trimmer, but also gasoline. Similarly, in order not to make a mistake with the choice, it is recommended to use gasoline of the brand recommended by the manufacturer (specified in the manual to the tool). However, everything is not so simple here, because at each gas station gasoline brand only have the same name, but have a 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 his trimmer for grass.

Manufacturers recommend using gasoline A-92 for their equipment, and some models require the use of brand A-95, which does not contain ethanol. Use gasoline brands AI-90 and below is not recommended, as they will entail a 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 filling the grass trimmer fuel brand AI-92
  • The farmer uses only gasoline of this brand, but buys it at gas stations where the price is lower or where it has to
  • It negatively affects the internal parts of the engine, because at one gas station it is really high quality gasoline AI-92, and at the second gas station it is 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 arises the need for overhaul. To avoid having to analyze the quality of fuel or to buy only expensive gasoline, it is recommended to fill only one filling station. Gasoline is only filled into metal canisters at gas stations, not plastic canisters.

There are manufacturers which offer special purified fuel for two-stroke engines. If you choose this option, then you do not need to choose the best filling station, the brand of gasoline and control its storage time.

Conclusion on the choice of gasoline for grass trimmer!

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

Choosing lawnmower oil

For the trimmer engines it is necessary to choose oils, marked “2T”, which are used for internal combustion engines with the volume of 50 cm3 to 200 cm3 and have air cooling. The first thing to pay attention to when buying oil is not the price but the protective properties of the material, because a small saving can later become a real headache for the owner and, as a rule, a big expense.

Two-stroke lawnmower oil

The main factor determining the quality of oil for grass trimmer is the alkali number. Exactly this component prevents oxidation of rubbing parts and slows down their destruction. In the process of operation the oil gradually loses its alkalinity and becomes oxidized. The optimum level of acidity (Ph) should not be less than 8-9 units.

The viscosity of the oil for brushcutter also has a great influence on the process of operation of the gasoline tool. This determines the ability to operate the grass trimmer at different temperatures. For example, summer brands of lubricants thicken even at a slight drop in temperature. As lawn trimmers are only used in spring and autumn, summer grade oils are an excellent choice.

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

What to consider when choosing an oil?

Modern two-stroke trimmer engines are filled with a mixture of gasoline AI-92 and oil marked “2T”. Using higher octane rating fuels increases the flash point, which burns out the lube.

STIHL fuel types

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

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

Oil change

The lubricant change must be carried out in good time, in accordance with the maintenance plan in the instruction manual of the mower. On average, the effectiveness of lubrication decreases after every 50 hours of operation. For the period when the lawnmower will not work, you should clean the oil filter and change the oil.

  • turn on the mower and allow the engine to idle for 15 minutes;
  • unscrew the plug in the tank opening;
  • put a container to collect the waste;
  • tilt the machine in the direction of the drain;
  • after draining the waste material, the plug is screwed in;
  • the mower is placed on a level surface and the opening is opened from above;
  • the oil is poured to the required level, the level is checked with a dipstick;
  • the hole is closed and the plug is screwed in.
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In most units the volume of liquid poured is up to 500-600 ml.

Lawnmower features

The engine oil in the lawnmower engine is distributed by the crankshaft: scooped from the crankcase and sprinkled on the parts. due to this design, the viscosity of the lubricant must be thick enough to leave a film of oil on the parts, but at the same time it must not be too thick so that it would hinder the movement of the parts or cause a hard crust.

On the other hand, lawnmowers operate mostly at positive ambient temperatures and the load on their engines is not as severe as the car engines. Lawn mowers most often do not need a “cold start” in the cold, which greatly reduces the life of the car engine and requires low-temperature properties of the lubricant.

Lawn mowers are usually air-cooled and therefore tend to have higher engine temperatures than liquid-cooled car engines.

The first filling is intended for the running-in of the engine. after five hours of work it is replaced, after which the new lubricant can be used for the whole season. In the future it is replaced according to the regulations after a certain number of moto-hours, or it is drained at the end of the dacha season and a new one is filled the next year.


When choosing an oil, great attention should be paid to its manufacturer. It is best to choose the brand advised by the manufacturer of the lawnmower. You can find information about the oil you fill, how often you change it, and recommendations for choosing a working fluid in the equipment’s instruction manual.

Many lawnmower manufacturers also produce their own oils that you will have to use for replacement if you want to keep the warranty on your equipment. In addition, the manual provides general characteristics that the oil must meet. When choosing an oil for replacement you should be guided by this list. This will allow you to choose an oil that will best meet the requirements of the manufacturer.

Many self-respecting manufacturers of lubricants offer their customers a separate line of products, which are designed for the maintenance of garden equipment. If it is possible to choose such a special oil, you should buy it.

  • Among all companies that represent their products on the Russian market, the best is Shell Helix Ultra. These oils are popular in all countries. For 40 years Shell specialists have been working on a unique technology to produce synthetic oil from natural gas. The resulting product is characterized by improved composition, which currently has no analogues. The manufacturer adds the necessary additives to the base composition, which allows obtaining products with different characteristics. Such oil must be purchased only at specialized outlets, since low-grade counterfeit products are not uncommon.
  • Also the company Liqui Moly presents quality products. The manufacturer produces several product lines, which have different purposes. This range includes products for servicing garden equipment. Such oils are designed for long-term operation of trimmers and lawnmowers, their specifications are developed in accordance with the features of modern equipment and manufacturers’ recommendations.

The company Liqui Moly adds additive packages to lawnmower oils, which are necessary to reduce wear and tear of the equipment and keep the engine clean. The main advantage of these fluids is the environmental friendliness, because they are created on a plant basis. Liqui Moly lawnmower oils comply with all environmental regulations.

Rasenmaher makes a good mineral-based lubricant, which was specially developed for garden devices. The product is suitable for 4-stroke engines with different cooling systems. Rasenmaher additive may be used exclusively at temperatures above zero. The manufacturer has carefully developed and selected additives for their product. The result is a wide range of functions:

Preparation of the mixture for the treatment of a chainsaw

The proportions of gasoline and chainsaw oil are determined before using the equipment.

Before you dilute gasoline with oil for a chainsaw, you need to prepare a special canister. Plastic and glass bottles are not suitable, also you can not pour the product directly into the tank. To find out how much oil per liter of gasoline in a grass trimmer should be poured, it is easiest to find out from the instruction manual, which is attached to the equipment.

The fuel must be stored for up to one month. Then the mixture is oxidized, due to which its properties change

Proportion of oil and gasoline for a boat motor

Two-stroke motors for the boat are necessarily filled with a homemade solution of two types of fuel. To know how much oil to add to gasoline for a grass trimmer or motor, you need to consider the stages of the equipment:

After the factory packaging is opened, the properties are preserved for six months, but the manually prepared mixture is stored for no more than one month.

The manufacturer should always specify in the instructions for the motorboat, which solutions will be suitable for a particular model. To find out how much oil to put in gasoline for a grass trimmer or boat motor, you need to read the factory documentation.

You need to buy special gasoline to fill the tank of a boat motor. The one for cars does not fit

It is recommended to have a reserve of mixture in a canister with you when you swim, so you can fill up the motor if necessary