How to dilute gasoline with lawnmower oil

How much oil to put in a grass trimmer 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 lies in the design of the engine. expensive segment of the device is equipped with a four-stroke models, and cheap. two-stroke. The latter option has advantages, including low weight, ease of use, and low cost.

The most important condition for the 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. Breaking 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.

The choice of gasoline for grass trimmer

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

Petrol tool manufacturers recommend using gasoline brand AI-92 to work, but for more expensive types will need fuel with a higher octane number. AI-95. Any brand, the marking of which appears the number 90 or less, for benzokoso not suitable, as they lead to rapid wear and tear. The problem stems from 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 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 a filling station, which sells proven gasoline (it can be determined by the reviews of regular customers). It is also important where to fill the fuel after purchase. only metal containers should be used for this (plastic is prohibited).

Preferably, when there is an opportunity to buy gasoline for high purity grass trimmer specifically for garden equipment. Then you can be sure of its quality and protection against counterfeit.

What to choose oil to fill a 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 will not be lubricated, then eventually they will quickly fail. 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 produced:

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

From the above it follows that the grass trimmer 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 tool manufacturer when buying. The instructions contain recommended information on which types of oil are best to use. If it is a TC-W3 standard, then it is not so important what composition the substance should have. In this case, mineral, semi-synthetic and synthetic can be diluted with petrol.

This is interesting! The main thing when choosing oil do not get caught on the counterfeit, as today you can 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 brushcutter lubrication

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

Filling up brushcutters with two-stroke engines

Household brushcutter models usually have a two-stroke engine. The lawnmower does not need much power or agility. It is well suited for the task. This engine is also much cheaper and simpler, but is fueled by a fuel mixture of oil and gasoline. This fuel is filled into the carburettor and fed to the cylinder in the form of a petrol-oil mist. Thus oil provides lubrication of all necessary parts, and in the process of engine operation it burns together with gasoline. But the mixture burns together with acrid odors and smoke, increasing the toxicity of the exhaust fumes.

Important! For these brushcutters, you need to use a special oil for two-stroke engines, which burns completely without leaving a smudge, and has a low evaporation. To make sure it mixes well with the gasoline, it is mixed with 20 percent solvent.

Fueling a brushcutter with a four-stroke engine

Four-stroke engines are used in professional brushcutter models. They are powerful and can run for long periods without interruptions or refuelling. As fuel they also use gasoline and oil, but they are filled into different tanks. That means that the oil is not part of the combustion process, which makes the exhaust fumes less toxic.

Also Also noteworthy! In addition to better environmental performance and less heat, four-stroke brushcutter engines are more economical. They use much less fuel, saving you up to 50% on gasoline and up to 80% on oil.

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What is the best oil for boat motors.

Also note that if these oils cannot be used to prepare gasoline mixture for boat motors. In 2t boat motors it is necessary to fill in a mix prepared from gasoline with octane number not lower than 89 and ultrapure oil with detergent additives of NMMATC-W3 marking in proportion 1:50 for operation mode, and. 1:25 for the running-in period (first 5-10 hours). Selecting the right oil.the basis of engine operation, that is why each manufacturer recommends pouring certain brands of oil into equipment, thereby guaranteeing the longest service life of the product. For tohatus boat motors (both 2t and 4t) the service center recommends to use german motul or american quicksilver motor oils. For mercury boat engines it is necessary to use only quicksilver motor oil. motul and statoil are the preferred brands for Honda boat engines.

Useful tip

It is not recommended to use the fuel mixture if more than two months have elapsed since preparation.

How to dilute gasoline and oil for grass trimmer for refueling

Two-stroke engines of the tool work due to the gasoline-oil mixture, which is prepared in the proportions that are specified in the technical certificate of the device. If you ignore the rules of mixing, the garden tool can quickly fail.

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

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

The fuel composition is mixed in special proportions.

If you dilute the fuel mixture with not enough lubricant, it will lead to rapid wear of the lawn mower parts

Check your trimmer manual for the optimum oil to gasoline ratio. It is usually 1:50, 1:40 or 1:25.

Dilute the gasoline with the lubricant component must first be in a suitable container: doing it immediately in the fuel tank is prohibited. If you ignore this rule, the operation of the motor may be inconsistent, as a result of which the tool will quickly fail. To dilute the fuel mixture, do not use plastic canisters or bottles, because gasoline can dissolve this synthetic material. Order of mixing the fuel:

  • Pour one liter of gasoline into a container (ideally a metal canister).
  • Add half of the required oil proportion.
  • Mix the liquids thoroughly, away from sources of open flame.
  • Pour the rest of the lubricant into the container and mix the mixture again.
  • Pour fuel into the fuel tank of the grass trimmer.

The work should be carried out wearing a respirator and rubber gloves. You can use a watering can for easy pouring. The ready mixture should not be stored for more 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 a quality oil for mixing with gasoline, buy it better at the certified gas stations.

Oil and fuel proportions

The calculation of the ratio of ingredients for 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 may be used.

Standard proportions

It is not unusual to have problems with oil and fuel proportions for the reliable operation of a brushcutter. The reason is different information in the sources. You may encounter a difference in the ratio data by a dozen units, and sometimes by half. So you can’t help wondering how much oil you need for 1 liter of gasoline: 20 ml or all 40. But for this, there is a technical passport for the product that you buy in the store. There should be a description of the device, the instructions for its operation and instructions on the rules of preparation of the fuel mixture.

First of all, you should take into account the information that the manufacturer recommends, because in the case of a mower failure you can present your claims to him and not to a third-party source. If there is no instruction in the passport, moreover, if there is no passport, it is recommended to look for another grass trimmer model from a more reliable seller.

For all other cases, when you have a lawnmower model in your hands and there is no way to know its technical features, there are standard proportions of the most likely components of the fuel mixture for a two-stroke engine. Basically, these units use gasoline AI-92 and a special synthetic oil, which contains a solvent for better mixing with fuel. Such oil evaporates slowly and has the ability to burn completely in the cylinder, leaving no residue.

The standard ratio of synthetic oil to gasoline is 1: 50. This means that you need 100 ml of oil for 5 liters of gasoline, and accordingly, the oil consumption per 1 liter of gasoline is 20 ml. Knowing the amount of oil needed to dilute 1 liter of fuel, you can easily calculate any rates for preparing fuel for grass trimmer. When using mineral oils, the standard ratio is often 1: 40. It is therefore necessary to use 25 ml of such oil for 1 liter of fuel and 125 ml for a 5 liter canister.

When operating a lawnmower, a person with little experience in operating such equipment will not find it difficult to determine and correct the actual amount of oil needed for a particular model. You should only pay attention to the exhaust gases (their color, toxicity of odor), stability of cycles, engine heating and developed power. details about what to expect when mixing petrol and oil in wrong proportions is presented in another article. There are trimmer models that run on gasoline AI-95. This also has to be taken into account.

If the fuel producer recommends this octane rating, it is important to follow the recommendation so that the service life of the machine is not affected.

Rules for blending

And now about how to properly mix components. But it would be more logical to start with analysis of widespread, but absolutely unacceptable mistakes, which “sin” many owners of this mowing unit. The following are considered mistakes when mixing the fuel mixture.

  • Adding oil to the fuel already in the trimmer’s gas tank. You will not get a homogeneous fuel mixture in such a way. It may work, but only if you shake the trimmer for a long time afterwards. But it is unlikely that someone will do this, given the gravity of the machine.
  • Pouring oil into the mixing container first and then adding gasoline to it. Gasoline has a lower density than oil, so if you add it to the oil, it will remain in the upper layer, i.e. there will be no natural mixing. Of course you can mix it afterwards, but it will take much more energy than if you do it the other way around. pouring oil on top of the gasoline.
  • Ignoring precise measuring tools to take the necessary volumes of ingredients to use. In other words, diluting the amount of oil or gasoline “by eye” is a bad habit when operating motor vehicles.
  • Taking empty drinking water bottles for the fuel mixture. Such containers are made of too thin polyethylene, which can be dissolved by gasoline.

Taking all of the above into account, we recommend using the following rules when mixing the fuel mixture for two-stroke grass trimmer engines.

  • Use only clean containers made of metal or special plastic for storing gasoline, oil, and ready-to-use fuel mixture and for preparing it.
  • Use a watering can to pour petrol into the expansion tank to avoid spilling, and a graduated graduated container or 5 ml and 10 ml medical syringe to add oil.
  • Pour gasoline into the fuel mixture canister first, then oil.
  • To dilute the mixture you should first pour only half of the planned volume of petrol into a container.
  • Then add to the gasoline all the amount of oil required for the mixture.
  • Thoroughly mix the contents of the dilution tank. It is best to stir with a tightly closed container in a circular motion. No foreign objects should stir the fuel inside the canister, as it is not known what material this object is made of, what kind of reaction it may have with the ingredients of the mixture and how clean it is.
  • Add the remaining gasoline to the mixed mixture and mix thoroughly again.
  • You can fill the lawn mower’s fuel tank with a prepared mixture.

It should be borne in mind that the prepared fuel mixture should not be stored for more than 14 days, as it loses its properties, stratifies and evaporates, which leads to changes in the proportions, and thus deteriorates the performance of the grass trimmer.

Oil change

Lubricant change must be done in a timely manner, according to the maintenance plan specified in the manual of the particular lawnmower model. On average, the lubrication efficiency decreases after every 50 hours of operation. Clean the oil filter and change the oil when the lawnmower is not in use.

  • turn on the mower and warm up the engine for 15 minutes at idling speed;
  • the plug in the tank opening is unscrewed;
  • Place a container to collect the waste;
  • tilt the unit toward the drain;
  • after emptying the used material the plug is screwed
  • the mower is placed on a level surface and the opening is opened at the top;
  • fill up the oil to the required level, check the level with a dipstick;
  • the hole is closed and the plug is screwed.

Poured fluid volume in most units reaches 500-600 ml.

The special features of lawnmowers are as follows

Engine oil in lawnmower engine is distributed by crankshaft: it is scooped up from crankcase and sprayed on parts. Due to this design, the viscosity of the lubricant must be sufficient to retain a film of oil on the parts, while at the same time it must not be too thick so as to interfere with the movement of parts or form 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 on car engines. Lawn mowers most often do not require a “cold start” in freezing temperatures, which greatly reduces the life of the vehicle engine and requires low temperature properties from the lubricant.

Lawn mowers are usually air-cooled and have higher engine temperatures than water-cooled car engines.

The first filling is for the running-in period. after five hours of operation the engine is replaced and the new grease can be used for the entire season. In the future, replace it according to the regulations after a certain number of moto-hours, or drain it at the end of the dacha season and pour a new one the next year.

Special features of lawnmowers

Engine oil in the lawnmower engine is distributed by the crankshaft: it is scooped up from the crankcase and sprayed on the parts. This design calls for the viscosity of the grease to be sufficient to prevent an oil film from forming on the parts but at the same time not too thick so that it would hinder the movement of the parts or create a hard crust.

On the other hand, lawnmowers work mostly at positive ambient temperatures and the load on their engines is not as severe as on car engines. Lawnmowers 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 from the lubricant.

On the contrary, lawnmowers are usually air-cooled and therefore have higher engine temperatures than liquid-cooled car engines.

The first filling is for the running-in of the engine. after five hours of operation it is replaced, then the new lubricant can be used for the entire 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 following year.

The special features of lawnmowers

The engine oil in a lawnmower engine is distributed by the crankshaft: it is scooped out of the crankcase and sprayed onto the parts. Because of this design, the viscosity of the lubricant should be sufficient to retain a film of oil on the parts, while at the same time it should not be too thick to interfere with part movement or form 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. Lawnmowers most often do not require a “cold start” in the cold, which greatly reduces the life of the car engine and requires low-temperature properties from the lubricant.

The first filling is designed 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. Further replacement is done according to the regulations after a certain number of moto-hours, or they drain it at the end of the dacha season and pour a new one the next year.

What kind of gasoline to fill up

You must buy unleaded gasoline with the tact number 92 or 95 for grass trimmers. As practice shows, gasoline AI-80 can cause damage to the device, which is a questionable economy. Fuel must be fresh, that is, after purchase it can be stored for no more than 60 days.

Other factors affect the quality of fuel, such as the use of a special lubricant for the lawnmower and diluting it in a separate container. It is also recommended to use special canisters designed for storing gasoline.

Two-stroke and four-stroke

Internal combustion engines used in trimmers are two-stroke and four-stroke. Two-stroke engines are uncomplicated by design. But they require a quality fuel mixture.

Gasoline for grass trimmer with a two-stroke power plant needs a precise dosage of lubricant. Disregarding this requirement leads to a sharp reduction in engine life. Have trouble starting the engine.

A four-stroke engine does not require a correct proportion of oil and gasoline. Formation of the right mixture. automatic. The components of the combustible mixture are stored in different containers. Fuel is expensive, but the costs are covered by the silent operation of the unit, the ecological purity of the exhaust gases.