Which Gasoline To Pour In A Stihl Trimmer 55

One of the important indicators of the durability of chainsaws and their quality work is the correct observance of the ratios of the constituent liquids when preparing the fuel mixture. It is known that an insufficient amount of oil leads to excessive friction of parts and their rapid wear, and excess. To the appearance of soot, overheating of the engine. This article will discuss the proportions of oil and gasoline for the Stihl chainsaw. This is especially important for beginners who have just purchased a tool.

Chainsaw Characteristics

Each chainsaw has three main elements that ensure its operation. These include a 2-pin carburetor engine and two tanks. The fuel mixture is poured into one, the oil necessary to lubricate the chain in the other. The volume of the fuel tank is 0.25 L, which allows you to work without stopping for 45–55 minutes. The volume of oil is less than about half. With this ratio of volumes, the contents of both tanks end almost simultaneously.

When operating 2-stroke engines, the oil pump system is not used, therefore, for the Stihl chainsaw, oil in gasoline has to be added to lubricate the shaft, piston and other rubbing parts. Attempts to work on one gasoline or non-observance of the proportions specified in the instructions for compiling a fuel-lubricant mixture of two components, lead to a breakdown of the tool.

Correct proportions

Most often, in the preparation of fuel for sawing, proportions of 1:50 and 1:40 are used. This means that 50 or 40 parts of gasoline add one part of the oil. The calculations are carried out as follows: 1 l = 1000 ml, 1000/50 = 20 ml or 1000/40 = 25 ml, that is, in the first case, pour 20 ml in each liter of gasoline, and in the second 25 ml of oil. If there is no instruction and you do not know the proportions for the preparation of the mixture, then use the following recommendations:

  • Tool and oil of the same brand. For example, for a Stihl chainsaw, the ratio of Stihl gasoline to oil will be as indicated on the container with oil, usually 1:50.
  • The substances used for the mixture have different brands. The ratio is 1:40.
  • There is only one brand, but there is no information on the ratios of substances on oil. They breed 1:40.
  • In the absence of any data on saw and oil, the mixture is diluted in a proportion of 1:40. The only thing you need to make sure that the oil is designed for two-stroke engines.

To run a new saw in the first three refueling tank with fuel oil add 20% more. In this case, instead of the ratio 1:50, it will be 1:42, and the proportion 1:40 turns into 1:33. A liter of gasoline will require 24 or 33 ml of oil, respectively. Other break-in events with a new saw are not carried out. Manufacturers are advised to work only at the highest speeds ever. After running the tool, the usual proportions are 1:50 or 1:40. In some cases, the manufacturer of the equipment indicates other ratios, for example, 1:25 or 1:32, they must be observed.

What kind of gasoline to fill in a chainsaw?

According to experts, you should use unleaded gasoline obtained by adding lead-free additives with an octane rating of more than 90. For foreign models, gasoline of higher grades is required and branded oils of the tool manufacturers are used. Perfect considered fuel grade AI-92. How to breed gasoline for a chainsaw “Stihl 180”? In this case, the oil content in the mixture is 1:40. Ai-95 fuel is quite suitable for it, but according to professionals, it is better not to use it for chainsaws.

The fact is that it is manufactured on the basis of AI-92 using certain additives that change the quality of the fuel. These components are deposited on the internal parts of the instrument and, upon reaching a critical mass, begin to exfoliate, disrupting the operation of the mechanism. The best option is to follow the instructions that come with the selected model. Gasoline is recommended to be used fresh, because during prolonged storage in containers, octane properties are lost.

Stihl chainsaw: which oil to use for gas?

A number of manufacturers producing equipment also produce their own consumables that are adapted to the operation of a particular engine. So Stihl also produces oil exclusively for its technology. It is equipped with special additives that can compensate for the quality of the fuel, improving the lubrication and cleaning of the fuel mixture. It should be noted that Husqvarna HP oil is universal and can be used for any chainsaw. It can be used at a temperature not lower than 10 degrees.

As well as for two-stroke engines, products of the following brands are used: Sadko, Kraissmann, Oleo-mac Prosint. If you use a Stihl chainsaw, how much oil per liter of gasoline needs to be poured? The ratio will be 25 ml of additive per liter of fuel. It must be remembered that there are oils for chains and motors. They are designed for different purposes and are not interchangeable. The use of chain oil for the preparation of a fuel and lubricant mixture leads to breakage of the tool.

Which brand to use motor oil?

For each model, the manufacturer advises a list of materials that must be used. It is better for the user to adhere to these recommendations, because the breakdown of the instrument due to inappropriate fuels and lubricants does not cover the warranty. In this case, the owner himself pays for the repair of the chainsaw, which can be up to 80% of its value. When it is not possible to follow the manufacturer’s recommendations, try to follow these rules:

  • Use oil designed for two-stroke engines only.
  • Do not use after expiration date.
  • Do not add used oil with a large amount of impurities to gasoline, as the tool mechanisms may be damaged.
  • Chain lubricant must not be used for the fuel mixture.
  • It is preferable to use synthetic and semi-synthetic oils, which are more expensive than mineral, but do not form harmful deposits.

How to make a mixture?

In order for the equipment to serve for a long time and properly cope with its functions, you need to know exactly how much oil you need to add to the Stihl chainsaw gasoline. Earlier, we found out that it is better to use a lubricant product from the manufacturer Stihl and unleaded AI92 or AI95 gasoline as components. Leaded grades of fuel adversely affect the operation of the unit and disable it. With these components, 20 ml of oil is added to the liter of gasoline for the mixture. Any violation of the proportions leads to the appearance of soot on candles and pistons, as well as the formation of scoring. The oils used may be green, blue or red.

By the color of the mixture, their presence is easily determined. To dilute the fuel, often complete with equipment, a special canister is attached. These tanks are marked with graduated divisions and there are two holes. It remains for the user to fill the tank with the mixture components to the required marks, close the lids and mix. Some use plastic bottles and syringes for measuring oil for these purposes. In this case, it is necessary to ensure that foreign particles or water do not get into the tank, all this will worsen the operation of the engine.

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What will happen if you do not take into account the manufacturer’s recommendations?

In violation of the rules for the preparation of fuels and lubricants and non-compliance with the proportions when adding oil to gasoline at a chainsaw “Stihl 180”; The following problems occur:

  • With increasing friction, the wear of the working surfaces of the parts will increase.
  • Due to insufficient lubricant, the bearings will begin to break down.
  • The full functioning of the mechanical components is disrupted due to the premature wear of parts, their service life is significantly reduced.
  • When using low-grade grades of gasoline and oils, the performance of the unit decreases with the subsequent breakdown of important components and parts.

Fuel is prepared before refueling the saw, avoiding excessive contact with oxygen. After completion of work, the remaining mixture must be drained.

Shelf life of the finished fuel mixture

Motorists know that it’s not worth storing gas for a long time, and the finished fuel mixture deteriorates even faster. Mix the necessary proportions of oil and gasoline for the Stihl chainsaw before starting work. Manufacturers allow storage of finished fuel for up to one month, and experts recommend that this period be reduced to 10 days. Immediately after mixing, the solution begins to lose its original properties and over time it becomes completely not of the same quality as it was prepared. Learn how to prepare so much fuel for a saw so that it can be spent at a time. It comes with experience. Keep the mixture in a gasoline-resistant opaque tightly closed container. For this, any metal plastic canister for combustible materials is suitable. They also use an oil container or glass containers made of dark glass.

Chain oil selection

In addition to the motor, for which all the proportions of oil and gasoline for the Stihl chainsaw have already been figured out, there is another important part, consisting of many moving links. A chain. To lubricate it, use not motor, but chain oil. It has completely different properties and is cheaper.

For a new tool, use only the oils of the manufacturer, which are recommended in the instructions. Otherwise, if a saw breaks down, it will be removed from warranty service due to non-compliance with operating conditions. It should be noted that the oils from the manufacturer are really high quality. After the warranty period, you can use any engine oil, making it replaced twice a year.


Customer reviews of Stihl saws are mostly positive. It is light in weight and affordable. Some complaints are found on the small power of the instrument. But for periodic use at home, it is quite suitable. And if you use the right proportions of oil and gasoline for the Stihl chainsaw, then it will last for many years.

Which Gasoline To Pour In A Stihl Trimmer 55

Owners of scooters and motorbikes, as well as owners of a gasoline tool with a two-stroke engine, are faced with the need to pour a pre-prepared mixture of gasoline and oil into the fuel tank, maintaining the necessary proportions. Motorists know that it is impossible to refuel equipment with a push-pull type power unit with pure gasoline. This will adversely affect the operation of the motor, its resource and lead to inevitable breakdowns. The oil-gasoline table will help determine the correct ratio of fuel to lubricant.

Let’s get to know the principle of the two-stroke operation more closely, we will deal with the mixing proportions, as well as the rules for preparing the fuel mixture.

Features and operating principle of 2t engine

Any owner of motor vehicles should have an idea of ​​the design of the engine and the principle of its operation. The power unit of the push-pull type is used not only in motor vehicles, but also in other technical devices. Lawn mowers, trimmers and others. Despite the completion of many models of modern technology with four-stroke engines, a two-stroke engine is still widely used. It is simple to operate, easy to maintain and repair, and also quite reliable.

The duty cycle of such an engine is carried out in a couple of compression strokes and a stroke as a result of energy from fuel ignition. Both cycles are carried out during one revolution of the crankshaft. The two-stroke engine lacks the phase of the fuel mixture intake and the exhaust cycle characteristic of four-stroke engines. The process of fuel inlet and exhaust gas takes place during the compression and expansion phases.

Thanks to this design feature, the torque and power developed by the motor increase with the same cubic capacity as a 4-stroke motor. And although the efficiency of a two-stroke power plant is lower compared to a four-stroke one, due to the two-stroke operation of the piston, the engine elements perform fewer movements. Subject to high-quality lubrication of the mating parts of the motor, it has a sufficiently high service life and is less susceptible to internal wear.

For the two-stroke operation, it is necessary to turn on the ignition, provide fuel supply and crank the engine crankshaft with a starter or kickstarter.

Further work of the two-stroke motor is carried out according to the following algorithm:

  • The piston begins to move towards the spark plug from bottom dead center. At this time, the fuel mixture enters the working chamber of the cylinder. The opening of the exhaust window for the exhaust outlet takes place, and the working mixture is compressed;
  • In the initial phase of the compression cycle, a pressure drop occurs in the chamber of the crank mechanism, contributing to the flow of a new portion of gasoline. In the upper phase of the piston movement, the working mixture ignites with a spark from a candle;
  • The energy resulting from the ignition of gasoline causes the piston to move to a lower point. Thanks to the open channel of the exhaust window, exhaust gases exit through an elbow connected to the silencer;
  • Subsequent movement of the piston causes the opening of the purge channel and the flow of gasoline into the working area of ​​the cylinder. The phase of displacement of the piston to the lower point completes the duty cycle of the motor and the cycle repeats.

In the process of supplying gasoline mixed with oil, the components of the power unit are lubricated. This distinguishes the lubrication system of a two-stroke engine from the lubrication system of a four-stroke engine, in which there is a gear pump for supplying oil to the area of ​​the mating parts of the motor.

Oil mixed with gasoline is lubricated in a crank mechanism

Why mix gasoline with oil

Not everyone knows how to dilute gasoline for a two-stroke Chinese scooter, and why there is a need to mix gasoline with oil in strictly defined proportions. The fact is that the design features and the principle of the two-stroke engine do not allow for the use of pure gasoline for its operation. Thanks to the oil introduced into the fuel mixture, lubrication is carried out and friction in the crank mechanism is reduced.

Mixing oil with gasoline during the preparation of the fuel mixture is a prerequisite for the normal operation of two-stroke engines.

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Diluting gasoline with oil allows you to:

  • Increase the life of the power plant;
  • Provide effective lubrication of the rubbing parts;
  • Avoid jamming of engine parts due to overheating;
  • Prevent possible breakdowns when the motor is running.

In addition, the use of gasoline mixed with oil in the required percentage ratio avoids the appearance of scoring, which is the cause of the repair. The lack of oil can cause overheating of the elements of the cylinder-piston group and the failure of the two-stroke engine.

Increased oil concentration will cause increased wear of the motor apparatus due to the formation of a thick layer of soot. That is why it is important to determine the proportion, using the table, which indicates the required amount of oil for various volumes of gasoline.

The reason for the formation of soot in the working chamber is the use of low-quality oil

What oil to grow gasoline for a motorcycle

In two-stroke engines, a separate filling of the lubricant into the crankcase is not provided.

Strict requirements are imposed on oil burning with fuel:

  • Lubricating fluid must provide effective lubrication of all parts;
  • The oil should burn easily and should not form soot after burning.

The use of low-quality oil for two-stroke engines is the cause of the formation of soot in the working chamber and a decrease in power.

When determining the type of oil, you should be guided by the recommendations of the manufacturer of the equipment specified in the instruction manual. Brand oils made by reputable manufacturers should be preferred. The preferred grade of oil is API-TB. It is also possible to use oils labeled API-TC.

The choice of type of lubricant is carried out depending on climatic conditions:

  • In the warm season gasoline can be diluted with mineral oil;
  • In the winter months, synthetic oils should be preferred;
  • For all-season use, branded semi-synthetics are suitable.

The manufacturer’s recommendations should be guided by determining the type of oil

For detailed information on the temperature threshold for use, read the information on the oil packaging. Knowing the ratio of fuel and oil, as well as the volume of the gas tank, necessary for stable engine operation, you can easily calculate how much oil is needed for a certain period, given the frequency of trips or the use of gasoline powered tools.

When buying oil to prepare the fuel mixture, you should pay attention to its purpose. This information is indicated on the packaging. Do not use tractor oil or boat lubricant to mix with gasoline to refuel a scooter or motorcycle. Please note that the nameplate of the oil for two-stroke engines necessarily has the designation 2T.

Oil gasoline table. Choose the right proportion

Novice owners of motor vehicles do not always have an idea how much oil to add to gasoline. Depending on the manufacturer’s recommendations specified in the instructions, the amount of added lubricant may vary. The most common ratios are 1: 50, as well as 1:40. Slight deviations from these proportions will not affect the operation of the two-stroke engine.

During the break-in period, when intensive grinding of the mating parts of the engine occurs, the amount of oil increases slightly. When the run-in is completed, they switch to a different ratio of the fuel mixture, involving the introduction of a smaller amount of oil.

Dealing with the proportion is easy. For example, a ratio of 1:50 means that a liter of lubricant should be added to 50 liters of gasoline. The use of measuring containers will greatly facilitate the process of preparing the mixture. Depending on the volume of available containers, the amount of added oil changes.

You can quickly prepare the mixture by deciding on the proportions

In particular, for a ratio of 1:50, the table will help determine the amount of oil injected:

  • To dilute 5 liters of gasoline, you need 100 ml of lubricant;
  • In a ten-liter capacity you will need to pour 200 ml of oil;
  • 400 ml of grease should be added to a 20 liter can.

Having determined the proportions, you can quickly prepare the mixture. However, you should not use a gas tank for this, alternately pouring gasoline and oil. Mixing must be carried out in a separate container.

How much oil to pour into gasoline. The rules for preparing the mixture

Having figured out how much oil to pour into gasoline, you can start preparing the fuel mixture. This will require a clean metal or plastic canister. First, the required amount of gasoline is poured, and then the lubricant is added in the right amount. After completing the dilution, tilt the canister a couple of times.

As a result of repeated shaking, the liquids are mixed, and the prepared fuel acquires a uniform color. Depending on the color of the added oil, the finished liquid may be greenish, bluish or reddish.

When performing work, safety precautions and fire regulations must be observed. Mixing work must be carried out in a ventilated area, and even better in outdoor conditions. When working with flammable liquids, smoking is not allowed. Mixing must be done with gloves to protect the skin from aggressive liquids.

The prepared mixture fills the fuel tank and the gas tank cap closes tightly. Storage of gasoline mixed with oil can be carried out in tightly closed cans. Gasoline, mixed with oil, retains its properties for a month.

That is why mixing should be done immediately before pouring, given the frequency of use of a scooter or motorcycle.

How to detect a mix out of proportion

There are a number of indirect signs by which it is possible to determine the mismatch of the amount of gasoline and oil when preparing the mixture:

  • The formation of contaminants in the float chamber and carburetor channels;
  • Significant tarry deposits on the elements of the fuel system;
  • Oxidation of carburetor walls and reduced elasticity of rubber parts.

Any of these signs indicates the need to adjust the mixing process. Observing the proportions recommended by the manufacturer, it is possible to ensure a long service life of the two-stroke engine, as well as to avoid unforeseen and, sometimes, expensive repairs.

Lawn mowers are a fairly common technique for controlling weeds in summer cottages, in household plots, on the road, and in housing and communal services. These devices have two more names. Trimmer and lawn mowing. These units differ in their engines. The more expensive of them have four-stroke engines, all the rest are two-stroke. Of course, the latter are the most popular among the population, as it is both simpler in design and mass lighter and much cheaper than its four-stroke competitors. However, two-stroke models are inconvenient in that the fuel mixture for them must be prepared manually, withstanding a strict dosage between gasoline and oil. In four-stroke analogs, the mixing of these components occurs automatically, you only need to fill the gas tank and oil tank with the appropriate substances. Let’s look at the issue of the correct refueling of a push-pull lawn mowing machine, since it depends on how effective and long the operation of such an aggregate will be.

Standard proportions

First of all, it is necessary to take into account the information recommended by the manufacturer, since in case of failure of the lawn mowers, you can make your claims to him, and not to an external source. If there is no instruction in the passport, and even more so if there is no passport, we recommend that you look for a different trimmer model from a more reliable seller.

For all other cases when you have a model of lawn mowers in your hands and there is no way to find out its technical features, there are standard proportions of the most likely components of the fuel mixture for a two-stroke engine. Mostly for these units, AI-92 grade gasoline and special synthetic oil are used, which contains a solvent for better mixing with fuel. Such oil evaporates slowly and has the ability to completely burn in the cylinder without leaving a deposit.

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The standard ratio of synthetic oil to gasoline is 1: 50. This means that for 5 liters of gasoline you need 100 ml of oil, and in accordance with this, the oil consumption per 1 liter of gasoline is 20 ml. Knowing the amount of oil needed to dilute 1 liter of fuel, you can easily calculate any norms when preparing fuel for the trimmer. When using mineral oils, the ratio of 1: 40 is most often standard. Therefore, 25 ml of such oil will be required per 1 liter of fuel, and 125 ml per 5-liter canister.

When the lawn mowers are working, for a person who has little experience in operating such a technique, it will not be difficult to determine and adjust the actual amount of oil needed for a particular model. It is only necessary to pay attention to exhaust gases (their color, odor toxicity), cycle stability, engine heating and developed power. Details about what consequences from the wrong proportions of mixing gasoline and oil can be expected are covered in another section of the article. There are options for lawn mowing running on AI-95 gasoline. This should also be considered.

If the manufacturer recommends a fuel with such an octane rating, then you need to follow the requirements so as not to reduce the working life of the equipment.

Mixing rules

And now about how to mix components correctly. However, it would be more logical to start by analyzing common, but absolutely unacceptable errors that many owners of this mowing unit “sin”. The following actions are considered to be errors in mixing the fuel mixture.

  • Adding oil to fuel already poured into the gas tank. Similarly, a homogeneous fuel mixture cannot be obtained. Perhaps it will turn out, if only then shake the trimmer for a long time. But hardly anyone will do this, given the severity of the unit.
  • First pour oil into the mixing tank and then add gasoline to it. Gasoline has a lower density than oil, so if it is poured to the oil, it will remain in the upper layer, that is, natural mixing will not occur. Of course, it will be possible to mix later, but energy will be required much more than if it were done the other way around. Pour oil into the gasoline poured.
  • Ignoring accurate measuring instruments to take the required volumes of ingredients used. In other words, diluting the amount of oil or gasoline “by eye” is a bad habit when operating motor vehicles.
  • Take empty bottles from under drinking water to prepare the fuel mixture. Such containers are made from too thin polyethylene, which can dissolve with gasoline.

Given all of the above, we recommend using the following rules when mixing the fuel mixture for two-stroke trimmer motors.

  1. To use for storage of gasoline, oil, ready-made fuel mixture and its preparation only clean containers made of metal or special plastic.
  2. Use to pour gasoline into the dilution tank with a watering can to avoid spillage, and to add oil, use a measuring container with volume risks or a medical syringe for 5 and 10 ml.
  3. First, pour gasoline into the canister to prepare the fuel mixture, and then oil.
  4. To dilute the mixture, only half of the planned volume of gasoline is first poured into the tank.
  5. Next, add to the gasoline the entire amount of oil required to prepare the mixture.
  6. Thoroughly mix the contents of the dilution tank. It is best to interfere by making circular movements with a tightly closed container. Do not stir fuel inside the canister with any foreign object, since it is not known what material this object is made of, what reaction it can enter with the ingredients of the mixture, how clean it is.
  7. The remainder of the gasoline is added to the stirred mixture and again thoroughly mixed.
  8. You can refuel the lawn mowing tank with the prepared mixture.

It must be borne in mind that the finished fuel mixture should not be stored for more than 14 days, as it loses its properties, delaminates and evaporates, which leads to changes in the proportions, and hence the deterioration of the trimmer.

The consequences of a violation of the ratio

The working life of the engine of the motocosa depends on how accurately you comply with the proportions of the oil-gasoline mixture recommended by the manufacturer. The fact is that the fuel mixture enters the cylinders in the form of gasoline-oil mist. And the task of the oil composition is the lubrication of moving and rubbing parts and surfaces of various parts located in the cylinder. If it suddenly turns out that the oil is not enough, but somewhere it will not be enough to get enough, the parts in contact with dryness will begin to damage each other. As a result, galling, scratches and chips are formed, which will necessarily lead to complete or partial unsuitability of the engine (for example, it may jam).

In the opposite case, when too much oil enters the engine, it does not have time to completely burn out, settling on the cylinder walls and eventually turning into solid particles. Coke, slag and the like. As you might guess, this also leads to engine failure. The most important thing that should not be allowed. Even a single violation of the proportions in the direction of lack of oil. It is better to pour a little oil 10 times than not to add only 1 time. It often happens that this time is quite enough to break the engine.

How to choose for lawn mowers?

For two-stroke engines, the lawn mowers use AI-92 or AI-95 gasoline. Most often. The first of these. Information on this is necessarily available in the technical passport of the product. If, for some reason, it is not known exactly which gasoline the trimmer should work on, you can choose it by testing both brands of gasoline in action. There will be no global changes in the engine from this, but it is quite possible to determine which gasoline a particular model of the unit “loves” more. This will be shown by the developed power, and throttle response, and heating of the engine, as well as its stable operation at all speeds.

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

You can start the selection even in the country of production.

For instance, for Chinese low-power trimmers, two ratios are mainly used. 1: 25 or 1: 32. The first is for mineral, and the second is for synthetic oils. About the choice of standard proportions for lawn mowing European and American manufacturers in connection with the type of oil, we have already talked about earlier. According to the oil class for household trimmers, you need to use TV oil according to the API classification. For more powerful. Ts class.

About what ratio of gasoline and oil is necessary for lawn mowing, see the next.