What oil to use for the gasoline trimmer. The role of oil in internal combustion engines

Can I put motor oil in my lawnmower?

Most modern lawnmowers use air-cooled, two-stroke gasoline engines. Power units rarely have a displacement of more than 200 cubic centimeters. Such a design ensures the moderate weight and efficiency of the machine.

In some cases companies make lawnmowers with water-cooled four-stroke engines. In this case, you should buy oil suitable for automobile engines. the construction of the internal combustion engines in this case will not differ.

Lubrication system for two and four-stroke engines

Four-stroke engines have separate systems for lubrication and air-fuel mixture.

Therefore, the pump supplies oil directly to the rubbing surfaces, i.e. the crankshaft bearing and the piston to the cylinder wall contact point.

This is done by placing the lubricant in a reservoir, from where it flows through ducts to the friction points.

Oil also flows through the crankshaft and connecting rod to the piston, where it washes into the piston and cools and lubricates the cylinder walls.

Two-stroke engines do not have a separate lubrication system, but they do have a crankshaft bearing which requires a reduction in friction.

In such power units, the fuel-air mixture enters first into the crankcase where the crankshaft bearing is located and then, under the action of suction, it passes by the piston, cooling it and lubricating the cylinder walls, and enters the combustion chamber.

However, gasoline does not have lubricating properties, so they fill such devices with a gasoline mixture, that is, a liquid fuel, in which a special oil is added.

The efficiency of fuel mixture lubrication is much lower than that of engine oil, so the bearing life of a two-stroke engine, and therefore the crankshaft and connecting rod, is noticeably shorter than that of a four-stroke engine.

In addition, the two-stroke lubrication system has special requirements to the oil, because it must maximize the combustion in the cylinder and form a minimum of toxic substances.

An overview of engine oil manufacturers

Husqvarna and STIHL are the two producers of the best two-stroke oils. The companies produce not only conventional mineral oils, but also synthetic lubricants designed for 2-stroke engines that operate in harsh conditions.

Husqvarna HP

It is a Swedish manufacturer, which includes several well-known brands, including Partner, known for its gardening equipment for semi-professional and professional use. Husqvarna makes not only machinery, but also high-quality lubricants used in nearly all brands of power tools.

The photo below shows Husqvarna HP two-stroke oil with special additives that compensate for the poor fuel quality, which is not uncommon in our country. It’s not always the octane number of gasoline bought at the gas station corresponds to the declared.

Green in color and semi-synthetic in composition. Can be filled in one or two gallon containers. The mixture is diluted in the standard ratio of 1:50 (20 g per 1 liter of gasoline). But when the engine is not yet running in, or work in cold weather, the proportion may be increased to 1:40.


Specially developed for STIHL machine engines. It is mineral based, has good lubricating and cleaning properties and can be used in ambient temperatures at least.10°С.

How To Pick The Right Engine Oil

The bottle has a special dispenser that allows the process of mixing the fuel mixture without the use of additional measuring containers.

Red coloured and max. storage time for 4 years in a sealed container. The latter can be of different capacities, both large and small (for single refueling). For example, a 20-gram container is available, the contents of which are added to 1 liter of petrol. It is a very practical option for chainsaw owners who only use them occasionally. Important: The mixture of petrol and this oil must not be stored for longer than 1 month, as it will lose its lubricating properties during this time.

gasoline, trimmer, internal, combustion


The oil belongs to the higher category. It is made on a fully synthetic basis, has a green color and has high lubricating properties, and thanks to the salt-free additives it does not create any carbon deposits.

This oil has been specially formulated to lubricate engines operating for long periods under high loads and low ambient temperatures up to.25°С. In addition, this lubricant is not harmful to the environment. If you pour it on the ground, it will decompose 80% in 21 days. The grease is packed in 100 ml and 1 liter bottles.

Getting the mixture

How much oil to pour per liter to get a quality gasoline mixture? It does not seem very complicated to mix the two substances. Preparation of the mixture is often complicated by the fact that different sources give different information. For example, the manual specifies the proportion 1 to 40, on the fuel tank of the grass trimmer 1 to 25, and on the oil canister 1 to 50.

Most experts say to mix in accordance with the instructions on the oil package.

There are a number of requirements for dilution. Do not add too much oil. This leads to lower ignition characteristics. The consequence of this is a devaluation of the efficiency of the power unit and an overall reduction in its service life. If the gasoline mixture is oversaturated with oil, soot deposits will form on the inner surface of the engine walls (cylinder vents). There is a risk of scuffing on the piston.

Neither too much oil nor too much lubricant in a gasoline base is a good basis for long-term performance of an internal combustion engine. For a trouble-free, long-lasting operation, the same amount of ingredients is needed. It is best to dilute with the same measuring tools in order to avoid unnecessary errors.

How to calculate, say, how much oil to pour for 1 liter of gasoline at the required ratio of 1 to 50? To do this, convert the volume of gasoline to milliliters, 1 liter = 1000 ml. Accordingly, to achieve a ratio of 1 to 50 thousand divided by fifty. You will need only 20 grams of oil per liter of gasoline. Someone measures oil with a 20 cc syringe, but for such purposes there is a special measuring spoon, which sometimes comes with oil from some manufacturers.

gasoline, trimmer, internal, combustion

For the convenience of calculating the oil to gasoline ratio, here is a table https://cmetnik.ru/oil/

The oil / gasoline ratio is based on a straightforward calculation method

Oil. the name is rather arbitrary. It is an oil base with a variety of additives. Without it, its lubricating properties are not that great.

According to the origin the base is divided into two kinds:

  • mineral. made by refining crude oil. its characteristics depend on the composition of raw materials and are not stable, that is why a lot of different additives are added to the mixture. Despite their action, it is recommended to replace the mineral material as often as possible;
  • synthetic. produced by directional synthesis. The properties of the mixture are predetermined and are distinguished by their stability. Synthetic compounds last longer and need to be replaced less often.

Additives added to the basis impart various additional properties to the blend:

  • antioxidant. prolongs the “life” of the mixture itself;
  • rust inhibitors. protect the engine from rusting;
  • anti-wear additives. reduce component wear
  • thorn modifiers and so on.

In order to obtain the same properties different additives are added to synthetic and mineral bases and in different percentages. That is why the fuel mixtures must not be mixed.

Recommendations for storing the ready-to-use fuel mixture for grass trimmer

After filling up the grass trimmer, many put aside the remaining mixture in the bottle until the next time. Sometimes this next time does not come soon enough, and stretches into the next year. Do not keep the mixture ready for so long, because the oil decomposes. After preparing the mixture, it must be used up within 1-2 weeks. In addition, you can also not store the tool for a long time with the fuel mixture poured into the tank, as the effect will be similar. To prevent unforeseen circumstances, it is advisable to consider the following recommendations for storing the ready mix of gasoline and oil:

  • Only prepare as much of the fuel mixture as will be used. If you don’t know how much fuel to use, 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
  • Before pouring the ready mixture into the tank, you must stir it thoroughly
  • Store the prepared mixture in a tightly screwed container, and in a place restricted to sunlight

If all recommendations are followed, the service life of the grass trimmer will be at least as long as the instructions indicate. Using quality consumables paired with following the recommendations for preparing the mixture in the grass trimmer, will result in a long and efficient service of the gasoline tool.

Gasoline for blending

The requirements for gasoline for blending are extremely high, t.к. it is the base of the fuel. The first thing you should not do is look for places to buy cheaper fuel (no-name gas station, etc.д.), because in the end all the apparent savings of a few tens can be eaten up by a costly repair of the engine, taken out of service with low-quality fuel.

gasoline, trimmer, internal, combustion

Using cheaper fuel with a lower octane rating puts more strain on the machine. Its wear is much faster, the resource is reduced, and, in proportion not one to one, but much more

The second thing to remember is that it is important to use only fresh gasoline for the basis of the mixture. Many people have fuel stocks at the country house or in a garage, which stand there up to half a year, waiting for their turn. Fuel that evaporates reacts chemically with the surface of a canister (especially plastic) and thereby gains new properties that are not good for an internal combustion engine. If gasoline has stood in a canister for a month or a month and a half, it is better to pour it into the fuel tank, where, mixed with the total volume of fresher gasoline, it will not cause any harm to the engine of the car. Two-stroke engines are more sensitive in this respect. That is why manufacturers recommend to use only the highest quality fuel.

As for the octane number, there are still debates among experts about what kind of gasoline to pour into the trimmer for grass. Most manufacturers recommend to fill up the fuel system only with high-octane gasoline of the 92nd brand. But there is one little proviso, quite often the instruction says “not lower than the 92nd”, which leaves much space for guessing, what kind of gasoline to use.

Of course, the performance (efficiency) of gasoline 95-th is slightly higher than the 92-nd. The latter, in turn, is the heir of the Soviet 80 th, which worked a lot of equipment. But with higher energy efficiency, the 95th has some peculiarities. For example, it is more suitable for modern models of cars, while the internal combustion engines installed in garden equipment are far from any constructive innovations, their structure remains practically unchanged for decades. For a two-stroke gasoline engine installed in most modern trimmers, it will be quite enough to fill up with 92-grade gasoline, bought at a proven gasoline chain.

It is best to look for options without additives labeled “eco”, “ecto”, t.к. you need a pure gasoline base to work accurately. the additives in the mixture will provide the oil.

gasoline, trimmer, internal, combustion

Is it necessary for the optimal work of the 95 gasoline, rather a philosophical question, and there is no specific answer. It is enough to remember that in the tolerances and recommendations, it occurs rarely enough, and this already says a lot. In addition, it is usually filled at your own risk, wishing to improve the characteristics of the. If you want to switch from 92 to 95 gasoline by experimenting, it is important to remember the consequences in the form of increased wear, unstable operation of the power unit and failure of its individual components. Of course, none of the above can happen, but the odds are very high if you go out of tolerance.

The product is compatible with 4T devices. One of the best budget solutions for trimmers, power tillers, lawn mowers, mini-tractors and other similar equipment. Lubricant on the surface creates a thin, dense protective film that keeps the engine in perfect cleanliness, greatly extending the life of the.

Oil for brushcutters. how to choose and in what proportions to dilute

Many of you have gasoline-powered tools in the household, for example, in a private home can not do without a chainsaw. You know, making firewood for the winter, it comes in handy for construction and repair, and in general, it’s a very useful tool. If the country house also has a decent-sized plot, then the grass trimmer or lawnmower, which also work on gasoline, is simply needed to fight the grass.

Of course, you can buy them and electric, but not everyone likes to pull a 30-meter extension cord to mow the area overgrown with grass up to the knee. That’s why most people prefer to work with a gasoline tool. As you know, you need to add special oil for two-stroke engines. That’s what we’ll talk about, because this is a very important aspect, if you do not add oil and add in the wrong proportions, then your engine very quickly “cracks” and your way will lie in the service center. To avoid all these troubles, you have to add only quality oil in right proportions.

The most popular for chain saws, brush cutters and trimmers are products of the famous company STIHL. It comes in two packs: 1 liter and 100 ml. A liter bottle is good for those who work a lot, but a small bottle will be enough for “one cut”. A 1 liter container costs 250 and a 10 ml container costs 60. If you take a big one, the savings are obvious.

The oil is added to gasoline in the ratio of 1 to 50, that is, for example, for 5 liters of gasoline add 100 ml. As you see, a small bottle is great for getting 5 liters of gasoline mixture to fill a chainsaw or grass trimmer. The large bottle has special markings on the side so you can see how much oil you have drained from it. If you bought a big 1 liter bottle, then buy a 20ml syringe at the drugstore as well. Very convenient. 1 syringe of oil per 1 liter of gasoline.

STIHL recommends you use original STIHL oil for your machine and it is ideal because it has been developed and tested specifically for STIHL power tools. Note that Stihl has its own brands, such as VIKING (popular models of gasoline trimmers). Use Stihl oil for those too and you won’t have any problems at all.

Science Please! : The Internal Combustion Engine

If you put more gasoline mixture than you can use, it is best to store the remainder in a metal canister or in a glass container. Never store the compound in a plastic bottle. Of course, if you use up the leftovers in a couple of days, you can pour the rest of the mixture into a plastic container, but if the mixture will be stored for a long time, then either a canister or a glass container. The thing is that the gasoline mixture corrodes the plastic bottle, there are microscopic deposits of plastic in the mixture and this is very bad for the engine. Keep this in mind if you want your tool to work long and without problems.

The second most popular oil brand is the notorious Husqvarna. Of course, if you think about it this way, still more people use chain saws STIHL, at least all my friends and their friends use in their work only them.

However, there are those who cherish Husqvarna tools and I understand them, because I personally do not see much difference between Husqvarna and Stihl, both tools are of very high quality. But I saw happy owners of chainsaws Husqvarna. they say the saws are great. I have not sawed myself, but I always listen to what people have to say. So if you have a Husqvarna power tool, it would be better to use a special brand oil for it. But nothing will happen if you dilute the gasoline with Stihl. But if a producer recommends you to use only his products, then that’s what we do.

You can find a liter capacity on the market. Black stylish bottle, with the same markings on the side as Stihl’s (to know how much oil has been poured out of the bottle). Looks absolutely identical to me. The price of such a bottle is 270, a little bit more expensive.

Both are high quality, cost about the same, each diluted at a ratio of 1 to 50. So feel free to buy any, of course, better to buy the oil of the brand that you have the tool. then everything will be perfect, just like the manufacturer advises. Have a good sawing, mowing, and may your power tool work for a long time without failures.