How Much Oil Per Liter Of Gasoline For A Lawn Mower

Oil selection and fuel mixture for lawn mowers

So, have you finally become the owner of a petrol lawn mower or lawn mower? And your imagination is already creating images of how you courageously cope with the thick grass. However, the dream of perfect lawn remains a dream when the question involuntarily arises: what oil to use and what are the proportions of mixing it with gasoline?

You can find a lot of information on the correct preparation of the fuel mixture on the Internet. This topic is actively discussed on forums and other thematic resources. But, despite such an active discussion, there are many inconsistencies that have to be dealt with.

It doesn’t really matter what technique is used, whether it be a lawn mower, a lawn mower or a chain saw, they have one thing in common. Two-stroke gasoline engine. Unlike the 4T, it has an oil sump. To feed it, it is required to prepare a special fuel mixture consisting of gasoline and oil. The resulting liquid is fed directly to the engine (carburetor). During use, all actively working parts are thoroughly lubricated, contributing to trouble-free operation under any operating conditions.

Lawn Mower Engine Oil

Depending on the chemical composition, lubricants are divided into the following main groups:

Mineral. They are made on the basis of oils obtained from petroleum distillates. They are characterized by high viscosity and require frequent replacement. The material is intended for low power appliances with an air cooling system. Recommended for warm weather.

Semi-synthetic. Are a kind the golden mean. They are based on a mixture of mineral and synthetic oils. A similar lubricant can be used in 2T and 4T engines, gardening and other equipment with air and liquid cooling.

Synthetic. They are made on the basis of special synthetic components containing esters. They are characterized by low viscosity and long service life. They can be used all year round, regardless of temperature conditions. Ideal for challenging heavy duty equipment with constant variable performance.

Any two-stroke oil, due to its 20% solvent composition, mixes well with fuel and has the feature of complete combustion. Their second characteristic feature is the color, which can be green, red or blue. Of course, this is not to say that some lubricant is better, but some worse. This is done solely so that it is convenient for the user to distinguish oil from pure gasoline.

Classification of engine oils:

The required parameters of oils for 2T engines are prescribed in the requirements of API TC JASO FC, API TC JASO FC ISO GD and API TC JASO FC E-GC. The most widespread classification systems are API. Based on this, 2T engine oils are divided into 4 large groups:

TA. Suitable for household appliances with an air cooling system and an engine volume of 50 cm3 or less.

TB. Used for more powerful equipment with an air cooling system and an engine size of 50.200 cm3.

TC. It is used in technology with high demands for oil quality. It is a high quality lubricant for 50.200 cc two-stroke engines. Great for lawn mowers, lawn mowers, trimmers, chain saws and second garden equipment.

TD. For liquid-cooled outboard motors.

Most suitable material for 2T motors of API-TB and API-TC class. However, it is necessary to refer directly to the product passport, where the manufacturer indicates the brand of engine oil recommended for its equipment.

Important! For lawn mowers, lawn mowers and other 2T garden tools, a special engine oil is provided for two-stroke engines with an air cooling system and a marking for garden equipment. Do not use lubricant for 2T engines with liquid cooling system. Also recommended oil for outboard engines, motorcycles and other equipment.

Oil to gasoline ratio for lawn mowers: why precision is so important?

We all loved in childhood cheat, therefore, the process of preparing the fuel mixture is not only simple, but also interesting. First of all, it is worth considering the fact that the proportions of the mixture may be different. This depends on engine configuration, oil markings and manufacturer recommendations. The fact is that with an insufficient amount of lubrication, the cylinder and piston heat up, which leads to shallow scuffing of all rubbing surfaces and, consequently, to failure of the cylinder. Piston group. Well, in case of its excess, on the contrary, we get coking of the piston ring and the formation of a large amount of carbon deposits.

Read more:  How Much Oil To Pour Into The Mower Engine

And even despite the fact that there is a generally accepted mixture ratio of 2% (for every liter of gasoline, 20 ml of lubricant). The proportions in the mixture are still recommended to be kept exactly.

How much to pour oil into gasoline for lawn mowers?

Everything is quite simple, with the correct balance, the engine runs at full capacity, all parts are thoroughly lubricated and do NOT wear out. As a result, we get a confidently working technique that will last more than one season.

To know how much oil to add to your lawnmower, you need to familiarize yourself with the performance of the product. Proportional ratios can be represented as follows: 1:25, 1:40 and 1:50, which means 1 part of oil for 25, 40 or 50 parts of gasoline.

1 liter of gasoline = 1000 ml

To determine the required amount of oil for a ratio of 1:25, you need 1000/25 and we will get a ratio of 40 ml.

We carry out the same actions for the ratio 1:40 and 1:50:

1:40 (for 1 liter of gasoline 25 ml of oil) 1:50 (for 1 liter of gasoline 20 ml of oil)

To ensure the correct proportion of lawn mower oil, it is recommended to use a special measuring container (not plastic). Eliminate the possibility of dirt and water getting into the fuel mixture. This can affect its quality. It is better to start preparing the mixture with gasoline. Pour it into the required mark, then add oil. A couple of tilts of the container are sufficient for mixing. The liquid quickly combines and acquires a uniform shade, which, depending on the structure of the oil, can be red, green, blue or other. After that, a properly prepared mixture is poured into the equipment fuel tank.

Before using the equipment, make sure that the tank cap is tightly closed. If you have more fuel, then the remainder can be stored in a special Canister or mixing container (no more than 14 days). It is recommended to drain the unused fuel.

Important! Be sure to follow the safety instructions. We mix liquids in an open area so that caustic gasoline fumes DO NOT accumulate in the room. Wear gloves and long sleeves. Do not smoke or ignite anything.


Gasoline with an octane rating of AI-92 is considered the most popular type of fuel for two-stroke engines. Due to its low cost, it is extremely rarely falsified. Therefore, not one hundred percent, but you can be sure of its quality. It is also permissible to use AI-95 fuel.

As for the storage of fuel, its period should NOT exceed 3 months. Over time, gasoline loses its properties, the resin becomes higher and a polymerization process occurs, which adversely affects the combustion chamber. The fuel mixture for lawn mowers made from low-quality materials settles in the form of carbon deposits, as a result of which the main components and systems of the engine suffer.

Recommendations for use and storage

The fuel is ready, poured into the fuel tank, the first spurt and the long-awaited start. However, if you want the equipment to work as long as possible, it is recommended to run it in for the first time. To avoid overheating the engine, it is recommended to adhere to the average load. After the main elements of the system are thoroughly lubricated, the load can be increased.

Certain rules should also be followed when preparing the braid for off-season storage:

Drain the remaining fuel from the fuel tank and carry out the final run until the fuel is completely depleted. Then, Pause operation and make sure the engine is completely cool.

Unscrew the spark plug carefully and add about 5 ml of lubricant. Pull the starter handle slowly so that the oil is evenly distributed inside the engine. After that, return the candle to its original state. Store equipment in a cool dry place.


Features of misapplication

The use of a contaminated or incorrectly diluted solution often leads to serious malfunctions. To prevent this from happening, you need to carefully monitor some of the engine indicators:

  • Rapid clogging of the fuel filter;
  • The appearance of dirt and various deposits in the carburetor, which will interfere with normal operation.

Fuel mixture preparation

Many mower manufacturers already supply special containers for gasoline and oil with graduated marks. But in order to more accurately mix lubricant and fuel, it would be better to use a syringe.

For operations to prepare a mixture of gasoline and oil, you will need simple equipment:

  • Watering can;
  • Medical syringe or measuring cup;
  • One liter capacity;
  • Oil suitable for two-stroke engines;
  • Petrol.

First, using a watering can, gasoline is poured into a liter container. For the fuel solution, it will be correct to use the same brand of gasoline as indicated in the instruction manual, since fuel with a lower octane number can damage the engine.

Read more:  Lawn Mowers Malfunctions And How To Fix Them

Next, we collect oil, observing the proportion, and pour it into the fuel. Stir the mixture gently. Fuel solution ready.

After adding oil to the fuel, the mixture acquires a special color, which in the future enables you to distinguish the ready-made fuel solution from pure gasoline.

You should not prepare the fuel mixture with a large margin. Lawn mowers do not recommend this.

Gasoline and Lawn Mower Oil Ratios

  • Oil quantity per liter of fuel
  • Fuel solution preparation rules
  • Fuel mixture preparation
  • Features of misapplication
  • Output

The introduction of lawn mowers on the market made it much easier to care for the grass on the lawns. Depending on the engine model, they are divided into 2 types: gasoline and electric. If you choose between these options, then gasoline is preferable, since it is much more mobile. No wires or electrical outlet required.

Carefully monitor and maintain your lawn to keep your lawn clean for as long as possible.

Fuel solution preparation rules

Before starting work, you should carefully study the instructions. In no case is it necessary to do everything approximately. Each manufacturer adds its own components to fuels and lubricants, so it will be useful to get acquainted with its recommendations.

The basic rules for preparing fuel for two-stroke lawn mowers are as follows:.

  • Strictly observe the proportions when preparing the fuel solution. If the concentration of the lubricating component is insufficient, then the piston with the cylinder will become very hot, and the engine may fail under such conditions. Burrs appear on the cylinder walls due to overheating, which will subsequently require serious investments in repairs.
  • Do NOT add too much oil to the mixture. A large amount of it will lead to the appearance of additional carbon deposits and an early reduction in the engine resource. Defect elimination is also expensive, just like saving oil.
  • Long lasting. than one month. Storage of the fuel mixture is not recommended as it starts to decompose and lose its basic properties. The prepared mixture can be stored for no more than 90 days; clean fuel is even less. Around 30.
  • Carefully monitor the cleanliness of the combustible solution, guard it from the ingress of various debris and other contaminants, due to which the engine may deteriorate.
  • After finishing work, if there is a long break, it is better to drain the fuel mixture from the tank.

Before preparing the fuel mixture, you should take care of its safety in the future. Gasoline is best stored in a metal container, fuel is allowed in a plastic canister specially designed for this. In no case should you store gasoline in plastic bottles: fuel enters into a chemical reaction with polyethylene and decomposition products, when they enter the carburetor, can disrupt its operation.

Oil quantity per liter of fuel

Two types of engines are installed on gasoline lawn mowers. Four-stroke and two-stroke. There are significant differences between them. In the first option, there is a separate supply of oil and gasoline, that is, it is not necessary to prepare a special fuel mixture. And the second type of motors requires constant lubrication of engine parts by mixing fuel and oil in a certain proportion.

If you have purchased a grass mowing tool with a two-stroke engine cycle, then you will have to start preparing the fuel composition to refuel the mower.

The fuel mixture consists of gasoline and a special oil for two-stroke engines. When choosing an oil, it is advisable to use a lubricant from the same manufacturer as the lawn mower, but this issue is NOT Fundamental.

You can distinguish oil for two-stroke engines from the second by marking on the label. It also indicates the ratio in which to dilute the lubricant with fuel. When using good and high quality oils, the dosage is usually: 1 part of oil to 50 parts of fuel, that is, 2% of the total fuel volume. Some owners are confused about THESE proportions. In fact, everything is very simple.

If the label says 50: 1, this means that 100 grams of oil must be added to 5 liters of gasoline. In other words, for 1 liter of gasoline, you need to add 20 grams of engine oil.


Applying the above recommendations, you can independently prepare a high-quality fuel mixture for a two-stroke engine. It will ensure the smooth operation of the gasoline lawn mower for an extended period, as well as help protect the engine from major malfunctions.

You can find out how to change the oil in a four-stroke lawn mower from below.

What gasoline to fill

Gasoline for the trimmer should be chosen unleaded with a stroke number of 92 or 95. As practice shows, AI-80 gasoline can lead to device breakdowns, which is a questionable economy.

Read more:  How to Mow Grass Properly with a Manual Lawn Mower

Fuel must be fresh, that is, after purchase it can be stored for no more than 60 days.

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

How Much Oil Per Liter Of Gasoline For A Lawn Mower

How to dilute gasoline with trimmer oil

Dilute trimmer gasoline in the correct proportion. An insufficient amount of oil can lead to poor lubrication of the lawn mower components, which contributes to rapid wear.

The correct ratio can be found in the instructions for the trimmer. Most often it is equal to 1:25, 1:40, 1:50. To obtain such proportions in 1 liter of gasoline, you need to add 40 ml, 25 ml and 20 ml of oil, respectively.

It is unacceptable to dilute gasoline with lubricant directly in the fuel tank; moreover, the proportion of oil and gasoline must be strictly observed. If you ignore this rule, the trimmer motor can be unstable, due to which it will quickly fail.

It is not recommended to use plastic bottles or canisters for this purpose. This is due to the fact that gasoline tends to dissolve plastic, which means that some of the plastic can get into the fuel tank, which can lead to carburetor breakdown. Although there are special plastic canisters with markings “flame”.

This will require:

  • Petrol;
  • Oil suitable for air-cooled two-stroke engines;
  • Canister, preferably metal;
  • Mixing vessel, also better metal;
  • Gloves;
  • Respirator.

Make a mixture of gasoline and oil as follows:

  • Pour 1 liter of gasoline into a container, add half the required portion of oil. Mix thoroughly, do it with extreme caution away from sources of open fire.
  • Add the rest of the oil to the trimmer gasoline and mix thoroughly again. Fuel can now be poured into the trimmer fuel tank.

The mixture can be stored for no more than three months, so it is better to dilute gasoline in such an amount that it is enough for a few used.

How to refuel the trimmer

A ready-made mixture of gasoline and oil can be stored NOT more than 3 months (pure gasoline is stored less). Dilute the amount of fuel that is sufficient for several trimmer uses. In general Prepare:

  • Gasoline and oil suitable for air-cooled two-stroke engines;
  • Metal canister and mixing container;
  • Respirator;
  • Gloves.

Adding oil to gasoline

Dilution instructions:

  • Pour 1 liter of gasoline into a container of suitable volume and add 1/2 of the required amount of oil.
  • Mix carefully, being at a decent distance from sources of open fire.
  • Add the remaining half of the oil to the fuel and stir again.

Trimmer refueling process

General tips for refueling a trimmer with a 2- or 4-stroke engine:

  • Place the fuel tank so that the lid is on top, then fill in the required amount of fuel.
  • DO NOT overfill the fuel tank. This will lead to one of the problems: overflow in the intake manifold and fuel filter, fuel ignition or engine breakdown.
  • Try to pour the mixture so that it does not spill. To do this, you can use LEIKOME.
  • If you do spill fuel, wipe it up immediately. Dispose of the cleaning material and do not store it indoors. It is fire hazardous.
  • The start-up of the device should be started after the fuel canister has been removed at a distance of more than 10 m.
  • If there was a long break between the operation of the mower, then the remaining old fuel must be drained.

How much oil per liter of gasoline for a lawn mower. Gasoline for four-stroke engine

Devices with a four-stroke motor are more complex. Oil and gasoline are poured into different containers, from where they are then fed to the engine. For a mower with such a motor, you need AI-92 and AI-95 gasoline. It is better not to use fuel with a lower octane number, because This will lead to unstable engine operation. In addition, do not use a lubricant designed for two-stroke models.

The choice of oil and gasoline for preparing a fuel mixture for a trimmer

Trimmer, or lawn mower. An indispensable tool in the household. over, its reliability, efficiency and long service life depend on many factors. For example, the quality of fuel. This means that you need to select the right trimmer oil, observe the proportions when adding to gasoline and the rules for refueling the device.