How much oil to put in gasoline for a brushcutter

How to dilute the oil with petrol for a lawnmower

Quick answer: the ratio 1:50 (gasoline-oil) is usually used.

The word “grass trimmer” has several different meanings. One of them directly applies to electric and brushcutters. varieties of lawnmowers, the tool needed to mow the grass. It is a relatively small and yet handy device that helps to cope with grass and bushes.

There are two main types of grass trimmer on sale: electric and gasoline. The first inconvenience is that, using the device on the site, you need an extension cord, which must be dragged behind you. Electric grass trimmer is devoid of this disadvantage, so it is more mobile, in addition, just as importantly, much more powerful.

In order to find out what proportion you need to add oil to the lawnmower, first of all, read the instructions that come with the device. It always says what proportion to follow. If for some reason the instructions are missing, try to find them on the Internet.

Most modern engines run on a mixture that has the same proportion. 1:50. In other words, you need 20 ml of oil for every liter of gasoline. Semi-synthetic or synthetic oil, which is required for two-stroke engines. Gasoline. not lower than АI-92.

It is recommended to mix liquids not in the fuel tank, but in a separate container. Pour the petrol, add the oil and give the mixture a good stir for a minute or two. Only then can you fill up the tank.

And remember, without oil the engine will quickly break down. But do not add a large amount of oil, as the engine parts are quickly covered with carbon deposits, and it can also fail.

Practical recommendations: how to dilute petrol with oil for grass trimmer

A lawn mower is as necessary for the lawn or garden as a pony tractor or chain saw. An unpretentious in operation tool, demanding only the quality of fuel mixture and its own cleanliness. And while there is usually no confusion about keeping the mower clean, some users occasionally have questions about the composition of the fuel.

How to mix petrol and grass trimmer oil to keep it in good working order for as long as possible? What are the consequences of too much or not enough oil in gasoline?? The answers to these simple questions are straightforward: you need to understand what role lubricants play when running a two-stroke engine.

Fuel for the two-stroke engine: theoretical part

Classification of two-stroke motor oils according to API system

The two-stroke power plant operation differs from four-stroke motors in that the lubrication of friction surfaces in the cylinder-piston group, crankshaft, bearing supports is carried out not from the crankcase, but due to the oil pre-dissolved in gasoline. For two-stroke trimmer engines, the general rules for the preparation of the combustible mixture are retained: gasoline must be diluted with a certain amount of oil intended for this purpose.

Oil for lawnmowers by its properties does not differ fundamentally from the lubricants intended for use in other garden equipment, having a gasoline two-stroke motor.

According to the API (American Petroleum Institute) classification several varieties of such oils are accepted:

  • class TA is used in air-cooled two-stroke internal combustion engines of mopeds, lawnmowers and other respective units with the volume up to 50 cm3; up to 200 cm3;
  • class TB. for mopeds, petrol saws, scooters and small motorcycles with a capacity from 50 to 200 cm3;
  • Class TC is used when operating motorcycles, snowmobiles and other land vehicles;
  • TD class determines whether it belongs to the special certification for boat engines, hydraulic scooters, two-stroke internal combustion engines of yachts and boats.

Note that class TA and TB are not identical in their composition and properties, so they are not interchangeable.

In addition to the API there is the JASO system, by which oil for 2-stroke engines is classified in Japan. This system uses the following quality level classification:

  • FA class is designed for use in countries with minimal legislative requirements for smoke emissions from engines;
  • class FB. for two-stroke engines of units operated in countries with high statutory requirements to the level of smoke formation;
  • Class FC is represented by smokeless motor oils intended for two-stroke engines;
  • Class FD. smokeless oils for two-stroke internal combustion engines with improved characteristics, intended mainly for outboard boat engines and stationary internal combustion engines of boats and yachts.

Choosing oil for a lawnmower, you should take into account that Russian manufacturers’ lubricants intended for use in two-stroke engines are often marked with the index 2T. There are also labels “self-mix” and “pre-mix. The first means that the oil mixes itself when you add it to the fuel, without any additional stirring. The second one should be diluted by forced mixing. by shaking or other means.

Practical recommendations for blending

A special reservoir simplifies the process of mixing gasoline and oil

As oil for a lawnmower should not be considered quite primitive options, which include automobile brands AC-10, ACZp-10 or exotic Chinese and garage origin “masterpieces. The bulk of greases for two-stroke engines are painted by manufacturers in colors that contrasts to gasoline: red, green or blue. There are a few recommendations that have been proven over many years of practical operation of trimmers.

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How much to dilute the lubricant for 1 liter of fuel, if the instruction manual specifies the ratio 1:40, on the fuel tank. 1:25, and on the oil canister. 1:50? The answer is unambiguous. you should follow the recommendations given on the lubricant package. Two-stroke engines don’t like oil starvation, but you shouldn’t add too much oil to petrol either. It provokes the formation of abundant soot deposits on the cylinder vents, which leads to scuffing on the piston.

The gasoline diluted with too much grease is less combustible, which devalues the engine efficiency and reduces its service life.

The proportion, how to dilute gasoline with oils for trimmers is not difficult to calculate. It is enough to divide the amount of gasoline by the recommended ratio. One liter of gasoline is 1000 ml. To calculate how much grease you need to add to get a 1:50 mixture, divide 1000 by 50. it turns out that 20 ml of oil is needed for 1 liter of fuel. It’s convenient to measure the necessary amount of oil with a 20 ml syringe.

You should not prepare a large amount of fuel mixture in advance. Gasoline diluted with oil should be stored in a tightly closed container in a darkened, cool room. It is more reliable to use steel or aluminum canisters than plastic containers for storage of prepared mixture. This is especially true for beverage containers. The polyethylene terephthalate used in their manufacture is not resistant to most petroleum products and additives.

It should be remembered that how to dilute gasoline with oils for trimmers, largely depends on the resource of the unit, its performance, fuel consumption and comfort when working on the lawn.

much, gasoline, brushcutter

What to choose oil to fill in a grass trimmer or types of lubricants

Grass trimmers and lawnmowers work from two-stroke engines, which have a simplified design. Rarely, but rarely, are there trimmer models with 4-stroke engines that run on pure gasoline. Two-stroke power units have no engine oil compartment (oil sump) which reduces the weight and cost of the tool. 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 machinery with air cooling. They are the cheapest type of engine lubricant
  • Semi-synthetic substances. they are used for equipment that has air and water cooling
  • Synthetic. suitable for all types of engines with different types of cooling. They don’t 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 oil is suitable for 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 indicate advisory information about what types of oils are better to use. If it is a TC-W3 standard, then the composition of the substance is not important. 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, since 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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Using the trimmer for grass in the garden

In modern conditions the purpose of the grass trimmer is to care for the lawn and the area as a whole. Unlike a traditional unit for mowing lawns, a grass trimmer has advantageous differences:

High mobility. This allows you to use the device in hard-to-reach and limited-sized places.

Versatility. Depending on the type of vegetation working tools change, which allows you to cut grass of any height and hardness.

Simple design. With timely maintenance grass trimmer does not require regular adjustments, frequent repairs.

When choosing a trimmer for grass, analyze the conditions of the unit, which will help make the right choice on the type and capacity of the engine.

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How to mix oil and gasoline for a two-stroke engine

The peculiarity of two-stroke engines is that fuel is filled into the tank together with oil. Every operation requires a properly mixed fuel mixture in proportions before starting your lawn trimmer. How to get it right? From our article you will learn how to dilute gasoline for a chainsaw, grass trimmer and other garden tools.

The purchase of unleaded gasoline is recommended for gardening equipment. Otherwise there is a risk of engine failure. Manufacturers advise fuel with an octane number not lower than AI-90, better AI-92 or AI-95. For individual recommendations for your tool, see the instruction manual. At the filling station, pour the necessary amount of fuel into the canister. It is desirable to use a metal container: in such a container does not generate static electricity from friction, which increases the safety of use.

Always buy brand name two-stroke oils, preferably API-TB or API-TC. The manufacturer should indicate the recommended brands in the instruction to the tool. Also note their composition. Mineral oils are suitable for use in warm weather. Synthetics are better, they are less viscous and can be used even in freezing temperatures. Semi-synthetic are mineral with improved qualities, universal for any season. To determine the temperature limit, please see the information on the packaging. Also pay attention to the volume. What matters is not the proportion of gasoline and chain saw oil, but how much fuel mixture you will need for one filling and how often you will work with the tool. If you have a grass trimmer or chain saw in your arsenal, and you use one or the other tool several times a week, it makes sense to buy a big 3 to 5 liter canister of oil. For several mowing in a dacha season, it is enough to take a bottle of 1 liter.

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Mixing oil and gasoline

At the beginning of work with the tool there is always the question of how much oil to add to gasoline for a chainsaw or grass trimmer. The important thing to remember is that for two-stroke engines the ratio is 1:50.е. you need 100 ml of oil for every 5 liters of fuel. Why it’s important to follow the proportions? Excess oil contributes to the appearance of soot on pistons and spark plugs, and its lack worsens the lubricating properties of the fuel mixture, which leads to the formation of scuffing on the piston group and increases the risk of engine failure.

The easiest way to determine gasoline and oil proportions for your chainsaw is to use measuring jugs. They have a scale with marks on them, which is easy to refer to. Before pouring gasoline and oil in, make sure the container is clean. Avoid getting water and dirt inside. it can affect the quality of the fuel mixture. First fill petrol to the proper level, then add oil to the proper level. Tilt the container several times to mix it. Liquids will quickly mix and the mixture will take on a uniform color, e.g. green or red (depending on the oil composition).

Good to know! Never use plastic drink bottles for storing and mixing fuel mixture. Gasoline corrodes plastics. Even if the bottle walls seem to be intact, harmful components will get into the fuel mixture, and together with it, into the engine. It is very bad for the carburetor.

Wearing gloves to protect hands from gasoline and oil. Also do not forget about the elementary rules of fire safety. Mix the liquids outdoors so that gasoline vapors do not accumulate indoors. Do not smoke while working and exclude other factors which can cause ignition of fuel and lubricants.

Pour the prepared fuel mixture into the fuel tank and close the cap tightly. If you have blended more than you can use at one time, empty it into a separate canister for storage or leave it in the blending tank. The main thing is to keep the cap tightly closed. The ready mixture can be stored for two weeks and used for refueling without risk to the engine. The only condition is that it must not be left in the fuel tank. If you won’t be using the tool for a long time, use up all the leftovers or drain it.

Now you know how to dilute gasoline for a chainsaw so as not to harm the engine. Try doing this yourself. After you have blended the fuel several times, you will know exactly how much you need, so you do not leave too much mixture. You can buy everything you need in our online store. You can expect longer service life from brand-name oils.

Selection recommendations

When choosing an oil for the grass trimmer, a number of parameters are taken into account:

  • Alkalinity. The oil’s pH should be alkaline and has to be between 8 and 9. The lower it is, the faster the oil becomes acidic and causes oxidation of the engine.
  • Viscosity. The higher the parameter, the faster the product thickens when the temperature goes down. Ideally should be precisely matched to the operating temperature.
  • Ignition temperature. Standardly it should not be lower than 2250C. Otherwise, the oil will quickly burn out and lead to defects in the piston group.

The application of lubricants for the 4-stroke model is not particularly difficult. you just need to fill the special tank and constantly monitor its level. 2-stroke examples are another matter. They require pre-mixed oil with gasoline, and only then pour into the lawnmower, but on no account add it separately in the gas tank. otherwise the grass trimmer motor will not receive effective lubrication and will break.

much, gasoline, brushcutter

The proportions must be strictly observed when diluting. In this case, the ratio of the components is regulated by the type of oil, conditions and manufacturer’s recommendations. For example, mineral oil is characterized by mixing in values of 1:25. 1:35, and for synthetic oil. from 1:50 to 1:80. Dilution must be carried out in a separate container by adding oil to the required amount of fuel. And only after the ingredients are fully mixed, the mixture is poured into the gas tank.

Proceed to the running-in of the lawnmower

After starting do not rush immediately run in the grass trimmer. Let the engine idle for about 5 minutes to warm up. While it is warming up, adjust the airflow with the choke knob until the line or blade bobbin rotates. As soon as the tool is warmed up, open the air supply fully by moving the corresponding lever to the “ON” position and squeeze the throttle trigger to 1/2 and hold it for 2030 seconds. Then we need to switch off the gas and let the trimmer work for 30 minutes at idle mode.40 seconds. Keep it this way for 1015 minutes. Then turn off and let it rest for 1520 minutes.

After the lawnmower has cooled down, we continue running in the engine according to the previous scheme. Start the hot grass trimmer with the choke open. Try not to hold the gas for a long time, because moving parts of the tool just rub against each other. Do not let the engine idle for a long time because it can overheat.

Next step is to run the gearbox of the petrol grasshopper. Choose an area with soft, young grass. Run it for 510 minutes with half to two-thirds of the throttle. After we take a break for 20 25 minutes. Repeat this cycle 34 times.

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In general, running-in of the lawnmower according to the described algorithm is carried out until the fuel mixture in the tank is fully exhausted. After that the tool is ready for continuous work. During the work keep track of the temperature of the gearbox and motor. They should not overheat.


It remains to choose what gasoline to fill in the trimmer for grass. There is not much choice. AI-92 and AI-95. The difference between them is quite substantial. If the manufacturer’s instructions do not specify what gasoline to use, you should stop at 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 declared brand. Buy gasoline only at branded gas stations, where the risk of buying AI-80 instead of AI-92 is almost 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 domestic trimmer for grass, but also the professional.


Many novice users believe that if you add more oil to the gasoline for the fuel mixture than necessary, it will benefit. It’s not. Unburned oil will not be expelled from the engine with the exhaust fumes, but will settle inside as a soot. This fouling threatens the integrity of the piston. If you use a mixture with too much oil regularly, the grass trimmer will smoke a lot and a drop in power is inevitable.

If there is not enough oil, the grass trimmer will overheat, the piston rings will collapse and the piston will jam. If oil is scarce, your trimmer will work for 30 to 40% less than its lifespan. If there’s not enough lubricant for more than 20%, the engine will jam after 20 to 30 minutes of vigorous operation. Every trimmer manual gives you the proportions on how to dilute the fuel mixture. Normally it is 1:25. 1:40 or 1:50. In practice it looks like this:

  • 1:25. 40 milliliters of oil per liter of gasoline;
  • 1:40. 25 milliliters of oil per 1 liter of gasoline;
  • 1: 50. 20 milliliters of oil per liter of gasoline.

Use the table to determine how much oil to put in a certain volume of clean fuel:

Gasoline (liters) Oil (milliliters)
25:1 30:1 35:1 40:1 50:1
1 40 33 28 25 20
5 200 165 140 125 100
10 400 330 280 250 200
16 500 495 420 375 300

Preparing the mixture for treating the chainsaw

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

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

The fuel should be stored for up to one month. The mixture then oxidizes, which changes its properties

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 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 a month.

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

It is necessary to buy special gasoline to fill the tank of a boat motor. The one designed for cars is not suitable

It is recommended to have a supply of mixture in a canister with you when sailing to refuel the motor if necessary

What kind of gasoline to fill up

It is necessary to choose unleaded gasoline with a tact number of 92 or 95 for grass trimmer. As practice shows, gasoline AI-80 can lead to device failures, 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 fuel quality, such as using special lubricant for the lawnmower and diluting it in a separate container. It’s also advisable to use special canisters designed for storing gasoline.

Two and four-stroke engines

Internal combustion engines used in trimmers are two-stroke and four-stroke. Two-stroke engines are not complicated by design. But require a quality fuel mixture.

Gasoline for a grass trimmer with a two-stroke power unit needs a precise dosage of lubricant. Ignoring the requirement leads to a sharp reduction in engine life. There are problems with starting it up.

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