How to Prepare a Trimmer Mix

How to Prepare a Trimmer Mix

So, have you finally become the owner of a petrol lawn mower or lawn mower? And your imagination already creates images of how you courageously deal with dense grass. However, the dream of an “ideal lawn” remains a dream when the question involuntarily arises: which 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 in forums and other thematic resources. But, despite such an active discussion, there are many inconsistencies that we have to deal with.

Actually, it doesn’t matter what technique is used, it can be a lawn mower, lawn mowing or chain saw, they are united by one – two-stroke gasoline engine. Unlike 4T, it does not have an oil sump. For its nutrition, the preparation of a special fuel mixture consisting of gasoline and oil is required. The resulting liquid is fed directly to the engine (carburetor). During use, all actively working parts are carefully lubricated, contributing to trouble-free operation under any operating conditions.

Lawnmower 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 highly viscous and require frequent replacement. The material is intended for low power equipment with an air cooling system. It is recommended to use in warm weather.

Semi-synthetic. They represent a kind of "golden mean". They are based on a mixture of mineral and synthetic oils. Such grease can be used in 2T and 4T engines, landscape gardening and other equipment with air and liquid cooling.

Synthetic. They are made on the basis of special synthetic components containing esters. Differ in low viscosity and long term of operation. They can be used year-round, regardless of temperature conditions. Ideal for complex machinery designed to work in harsh conditions with constant variable performance.

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

Motor oil classification:

The required oil parameters for 2T engines are specified in the requirements of API TC JASO FC, API TC JASO FC ISO GD and API TC JASO FC E-GC. The most widely used classification system 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 displacement of not more than 50 cm3.

TB – It is used for more powerful equipment with an air cooling system and an engine capacity of 50. 200 cm3.

TC. It is used in technology with high demands on the quality of oil. It is a high-performance lubricant for two-stroke engines with a volume of 50. 200 cm3. Great for lawn mowers, lawn mowers, trimmers, chain saws and other garden equipment.

TD. For outboard motors with liquid cooling.

The most suitable material for 2T motors of API-TB and API-TC class. However, you must refer directly to the product passport, where the manufacturer indicates the brand of motor oil recommended for its equipment.

Important! For lawn mowers, lawn mowers and other 2T garden devices, a special engine oil is provided for two-stroke engines with an air cooling system and marked "for garden equipment". It is forbidden to use lubricant for 2T engines with a liquid cooling system. Oil for boat outboard engines, motorcycles and other equipment is also not recommended.

The ratio of oil to gasoline for lawn mowers: why is accuracy so important?

We all loved to “chew” in childhood, so 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 can be different. It depends on the engine configuration, oil labeling and manufacturer’s recommendations. The fact is that with insufficient lubrication, heating of the cylinder and piston occurs, which leads to shallow tearing of all rubbing surfaces and, consequently, to failure of the cylinder. Piston group. Well, in the case of its excess, on the contrary, we get coking of the piston ring and the formation of a large amount of soot.

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

How much oil to pour in gasoline for lawn mowers?

Everything is quite simple, subject to the correct balance, the engine runs in full, all parts are carefully lubricated and not abraded. As a result, we get confidently working equipment that will last more than one season.

To know how much oil to add to the lawn mower, you need to familiarize yourself with the operational characteristics of the product. Proportional ratios can be represented in this form: 1:25, 1:40 and 1:50, which means 1 part of oil for 25, 40 or 50 parts of gasoline.

Video: How to Prepare a Trimmer Mix

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 get a proportion of 40 ml.

We perform the same actions to a ratio of 1:40 and 1:50:

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

To ensure that the proportion of oil for lawn mowing is correctly observed, it is recommended to use a special measuring container (not plastic). Exclude a possibility of hit in a fuel mix of dirt and water. This may affect its quality. It’s better to start cooking the mixture with gasoline. Pour it to the desired mark, then add oil. A pair of tank slopes are sufficient for mixing. The liquid quickly connects and takes on a uniform shade, which, depending on the structure of the oil, may be red, green, blue or another. Then the correctly prepared mixture is poured into the fuel tank of the equipment.

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 container for mixing (no more than 14 days). It is recommended to drain fuel that is not used up to the end.

Important! Be sure to follow safety instructions. Mix liquids in an open area so that caustic gasoline fumes do not accumulate in the room. Wear gloves and long sleeve clothing. Do not smoke or set fire to anything.


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

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

Recommendations for use and storage

The fuel is ready, filled in 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 that you first run it in. In order to avoid overheating of the engine, it is recommended to adhere to an average load. After the main elements of the system are carefully lubricated, the load can be increased.

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

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

Carefully turn out the spark plug and fill in with 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 the equipment in a cool, dry place.


Friends, here’s the summer on the doorstep, that is, the season begins, and it’s always some kind of work on your site at the cottage or in the country using garden and other motorized equipment and therefore I am often asked how to prepare a mixture for two-stroke engines and which one to choose gasoline and oil.

Most garden motor equipment such as trimmers, chainsaws, brush cutters, some lawn mowers and motor cultivators (among them there are models with a 4-stroke engine) are equipped with two-stroke internal combustion engines, that is, as the name implies, the work process in them takes place in two cycles, and not in 4 as, for example, in most gasoline automobile engines. For us, it’s important now that two-stroke engines usually have a single lubrication and power system, that is, a gasoline-oil mixture is poured into the fuel tank. Therefore, let’s examine the question of how to prepare a fuel mixture for two-stroke engines, which oil and gasoline to choose.

That’s how the two-stroke engine works

How to prepare a mixture for two-stroke engines of various motorized vehicles

Here, in any case, you should read the instruction manual for your device, be it a chainsaw trimmer and something else. The fact is that different manufacturers give different recommendations on the oil-gasoline ratio. It can be 1:40 and 1:50 and 1:80. It also happens that the recommended ratio is indicated on the oil can itself. In the general case, I personally use a ratio of 1:50. In general, do not really worry if the manufacturer recommends using a ratio of 1:50, and you have prepared a mixture of 1:40 or 1:60. Nothing will happen once, even if you develop a whole tank. Just in the first case, the smokiness of the exhaust may increase. I happened to see people who prepared a mixture by eye and, in the absence of special oil, used ordinary olive! And nothing bad happened. Personally, for all my devices with a two-stroke engine, I prepare the mixture as follows: I take a 2 liter Pepsi bottle, for example, and for measuring the oil I use a regular 40 gram vodka glass. Thus, the ratio is 1:50. The cooking technology itself is as follows – pour oil into a bottle through a funnel and then fill the bottle with gasoline halfway. Half to make it easier to mix. After this, shaking and rotating the bottle, mix its contents until a uniform color, depending on the oil, it can be reddish and yellowish, or even bluish. After mixing, pour the remaining half of the gasoline and shake it again. Everything – the mixture is ready to use.

Gas for two stroke engines

Everything is simple here – ordinary gasoline is used. For the octane number, in general, you should be guided by the instructions of the operating manual. If this moment is not specifically registered there or a choice is made on the octane number, usually between 92 and 95 gasoline, then I recommend using only 95 gasoline! Many still believe that any gasoline is obtained from 80 by adding additives and, accordingly, 95 is therefore worse, because of it there are more of them in the octane number. Friends, this is not so for a long time! Naturally, additives have always been used and will always be used. But be aware that almost no major refineries already produce 80 gasoline, and the difference between the cost of 92 and 95 gasolines for plants is almost the same, so no one now receives 95 out of 92 gasolines, these are all old stories.

Do not hesitate and feel free to buy 95 gasoline instead of 92

But if you refuel your motorized equipment with 95 gasoline (unless the instructions clearly indicate otherwise), then you will almost certainly avoid detonation when the motor is running and, accordingly, extend its life. Naturally, we do not forget that you should buy gasoline only at large gas stations, where you will almost completely buy high-quality gasoline.

Two-stroke engine oil

Well, talking about oil for two-stroke engines, I also want to note that there is no point in using the original branded oil, which the manufacturer of your chainsaw or trimmer insists on using. This is all marketing and often branded oil is just some ordinary oil from one of the many manufacturers who have an agreement with the brand of your motorcycle equipment and, accordingly, their label is a big name and the price is three times more expensive.

Well, in conclusion, it is worth noting that you should not store the prepared fuel mixture for a long time, the fact is that oil dissolved in gasoline does not retain its properties for very long. Additives, etc. May be destroyed. Therefore, the optimal storage of the prepared mixture is not more than a month, and a maximum of no more than three. As an indirect reference point of suitability, we can consider the absence of sediment and delamination of the mixture.