What oil to mix with gasoline for grass trimmer

Fuel mix for two-stroke engines

Grass trimmers, which are equipped with a two-stroke motor, do not have a separate system designed to supply oil to lubricate the rubbing parts. For this reason, you should not fill such devices with pure gasoline, but with a mixture of fuel and engine oil. The latter should be specifically designed for two-stroke engines. Using automobile engine fluid will lead to premature engine failure.

Preparing Fuel Mixture for Dual Fuel Engines

Gasoline for a petrol mower with a two-stroke engine is AI-92. When using AI-95, engine overheating and uneven engine performance may occur. Gasoline and oil should be mixed in the proportion 50:1, where 50 is fuel and 1 is oil. It turns out that you need 20 ml of oil per 1 liter of fuel.

If the engine is worn out or the tool works with a high load, the proportion is 25:1. If there is too little lubricant, scoring will occur on the cylinder walls and piston surface. The piston ring will then be destroyed, causing the engine to jam. Too much lubricant is not that critical, but it can cause fouling. In this case the piston ring will get corked, which will reduce the power of the device.

gasoline, grass, trimmer

Oil and gasoline proportions for the fuel mixture

What type of oil to fill the grass trimmer or types of lubricants to choose

Grass trimmers and lawnmowers are powered by two-stroke engines, which have a simplified design. Rarely, but there are trimmer models with 4-stroke engines that 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 is reduced and their cost is reduced. 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. designed for low power, air-cooled machinery. It is the cheapest type of lubricant for engines
  • Semi-synthetics. they are used for machinery that has air and water cooling
  • Synthetic. suitable for all types of engines 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 for the grass trimmer oil with any composition is suitable. mineral, synthetic and semi-synthetic. Oils with different chemical compositions differ in price, so it is necessary to rely on the recommendations of the tool manufacturer when buying. The manual should give you specific recommendations on the oils that 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, you can dilute mineral, semi-synthetic and synthetic with gasoline.

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

How to choose for a lawn mower?

Gasoline of AI-92 or AI-95 grades is used for two-stroke trimmer engines. Most often. the first of the above. This necessarily has information in the technical passport of the product. If for some reason you don’t know exactly on what gasoline grass trimmer should work, you can choose, having tested both brands of gasoline in action. There will be no global changes in the engine, but there are some factors that can be used to determine what kind of gasoline a particular model likes. This will show the developed power, injectivity and engine heat, as well as its stable operation at all engine speeds.

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

You can even start selecting by country of manufacture.

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. On the choice of standard proportions for European and American manufacturers of petrol and lawnmowers in connection with the type of oil, we have already told earlier. According to the oil class for household trimmers need to use oil TV by API classification. For more powerful trimmers. TC class.

About what ratio of gasoline to oil is necessary for a lawnmower, see the following video.

Gasoline and oil proportions

Select the solution should take into account the recommendations from the manufacturer of the grass trimmer. As a rule, for grass trimmer use a brand of gasoline AI-92. If the instruction indicates the 95th, then it is necessary to dilute this and without unnecessary savings (you should not take lower than the 92nd). Two-stroke motor oil is distinguished by API classification. Only two types are worth noting:

  • TA. for air-cooled engines (suitable for lawn mowers).
  • TB. for small engines up to 200 cm³ (suitable for chain saws and small motorcycles).

Other categories (for snowmobiles, boats, etc.п.) not used in grass trimmers. when buying this product pay attention to the package. Domestic manufacturers have a notation there regarding mixing with fuel:

The following table of recommended volumes shows how many milliliters of lubricating fluid are required for any given amount of engine fuel, taking into account the proportions required:

Gasoline (in liters) Oil (in milliliters, depending on proportions)
1:20 1:30 1:40 1:50
1 50 33 25 20
1,5 75 50 38 30
2 100 67 50 40
3 150 100 75 60
4 200 133 100 80
5 250 167 125 100
6 300 200 150 120
7 350 233 175 140
8 400 267 200 160
9 450 300 225 180
10 500 333 250 200

The operation of a two-stroke machine is different from that of a four-stroke motor: the rubbing surfaces in the crankshaft and other parts of the machine are not lubricated by the crankcase but by oil that has been previously diluted in petrol. The general rule for two-stroke engines is that gasoline is diluted with a certain volume of oil intended for this purpose.

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The fuel must be mixed in specific proportions.

Dilute petrol with the lubricant component in a suitable container first: do not do it immediately in the fuel tank. If this rule is ignored, motor operation can be intermittent, causing the tool to fail quickly. To dilute the fuel mixture, you should not use plastic canisters or bottles, because gasoline can dissolve this synthetic material. Order of fuel mixing:

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

The work should be done wearing a respirator and rubber gloves. You can use a watering can for easy pouring. The ready mixture should not be stored 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 a quality oil to mix with petrol, buy it at a trusted gas station.

Guide For Mixing 2 Stroke Fuel For 52cc Petrol Brush Cutter, Grass Line Trimmer

Oil and fuel proportions

Calculation of the ratio of ingredients for preparing fuel for grass trimmer should take into account the recommendations on the package from the oil. The standard proportion is 1:50. Any quality oil for two-stroke engines is allowed to use.

What oil to pour into the 2-stroke engine trimmer for grass

For gasoline grass trimmer key element that determines the longevity of its operation is lubrication. A two-stroke engine that gets oil together with fuel will serve much longer, if the owner is selective enough in this matter and drinks only high quality products from reliable suppliers.

Our review presents some of the best oils for 2-stroke trimmers. The rating was compiled on the basis of the manufacturer’s stated characteristics of lubricating products. The assessment also takes into account the experience of 2-stroke equipment owners who have successfully used one of these lubricants for a long time.

gasoline, grass, trimmer


It remains to choose what gasoline to fill in the trimmer for the grass. There is not much choice. AI-92 and AI-95. The difference between the two 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 declared 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 up with AI-95, do not use other brands of gasoline. If the engine starts, it will work irregularly and quickly overheat. So you run the risk of putting out of service not only the motor of the domestic trimmer for grass, but also the professional one.

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Recommendations for storing the ready fuel mixture for grass trimmer

After filling up the grass trimmer, many put off the mixture left in the bottle until the next time. Sometimes this next time comes not soon, and stretches to the next year. You can not store the ready mixture for so long, because the decomposition of oil takes place. After the mixture has been prepared, it should be used up within 1-2 weeks. Besides, it is also impossible to store the tool for a long time with the fuel mixture poured into the tank, because the effect will be similar. To prevent unforeseen circumstances, it is advisable to consider the following recommendations for storing the finished gasoline-oil mixture:

  • Use only as much fuel mixture as you will use. If you do not know how much fuel you are using, then it is better to prepare less
  • If fuel mixture remains in the grass trimmer‘s tank (when the tool is hidden until the next season), it must be completely used up or drained
  • Stir the mixture thoroughly before pouring it into the tank
  • Store the ready mix in a tightly closed container and in a place that is not exposed to sunlight

If you follow all the recommendations, the service life of the grass trimmer will be no less than that specified in the manual. Using quality consumables in a pair with compliance with the recommendations on the preparation of the mixture in the trimmer for grass, will result in long and efficient service of the gasoline tool.

The order of use and importance of oil in a two-stroke engine

Engine operation is associated with the friction of moving parts of the cylinder and liner, cams, joints. The friction of the parts heats the surface, the expansion causes scuffing. If in the gap between the mating parts is a composition in the right proportion of oil and gasoline for the lawn trimmer, a number of problems are removed:

  • the parts in the engine work with reduced friction and heat up less;
  • the lubrication in the gaps prevents corrosion of the parts during prolonged storage, flushes out particles from friction;
  • prolongs the life of the engine.

The appearance of additional properties contribute to the used additives that are in the oil composition in the amount of 5-15%. It is the additives that create anti-corrosion, anti-wear and frost resistance properties of oils.

Incorrect oil composition can kill the engine, causing deposits of carbon in the cylinders, coking and rapid engine wear.

It’s important to know how much oil you should add to your brushcutter’s gasoline. The first step is to read the owner’s manual and follow the recommended ratios. Using a mixture that takes into account the model and configuration of the engine, the climate conditions and the load will prolong the life of the lawnmower. Experienced users advise, when purchasing a tool, immediately buy the recommended oil as a reserve.