How to dilute gasoline for a Chinese chainsaw

Domestic and professional chainsaws are powered by two-stroke internal combustion engines that run on a dosed mixture of gasoline and engine oil adapted to the difficult working conditions. Correct proportions of oil and gasoline in a chainsaw is one of the important prerequisites for the engine stable traction characteristics and low-cost exploitation of its intended life.

The need to get sufficiently high power from a small-cube power unit forces chainsaw engines to operate at high rpm, that’s why the quality of both components of the fuel mixture is subject to higher requirements.

It is recommended to buy unleaded gasoline to operate your gardening equipment. Otherwise there is a risk of engine failure. Manufacturers advise fuel with an octane number not lower than Ai-90, better AI-92 or AI-95. See manual for specific recommendations for your tool. At the filling station, pour the required amount of fuel into the canister. It is desirable to take a metal: in such a container does not arise static electricity from friction, which increases the safety of use.

Use brand name oils for two-stroke engines, preferably API-TB or API-TC. The manufacturer should indicate the recommended brands in the instruction manual for the tool. Also take into account their composition. Mineral oils are suitable for use in warm weather. Synthetic oils are better, they are less viscous and can be used even in freezing temperatures. Semi-synthetic oils are mineral oils with improved qualities, universal for any season. Check label for temperature rating. Also note volume. What matters is not the proportion of gasoline and oil for a chainsaw, but how much fuel mixture you will need for one filling and how often you will work with the tool. If you have a grass trimmer or chain saw in your arsenal, and you use one or the other tool several times a week, it makes sense to buy a big 3 to 5 liter canister of oil. For several mowing during the dacha season, it is enough to take a bottle of 1 liter.

Mixing oil with gasoline

When you start working with a tool, the question always arises how much oil to add to gasoline for a chainsaw or grass trimmer. It is important to remember that for two-stroke engines the ratio is 1:50, t.ะต. you need 100 ml of oil for every 5 liters of fuel. Why it is important to maintain the correct proportions? Excessive oil causes soot on pistons and spark plugs, and lack of oil reduces the lubricating properties of the fuel mixture, which leads to scuffing of the piston group and increases the risk of engine damage.

It is easiest to observe the proportions of gasoline and oil for a chainsaw, using measuring containers. They have a scale with marks, which is easy to navigate. Make sure the container is clean before pouring gasoline and oil. Do not allow water and dirt to get inside. this could affect the quality of the fuel mixture. Fill gasoline to the proper level first, then add oil to the proper level. Tilt the container several times to mix. The fluids will mix quickly and the mixture will take on a homogenous color, such as green or red (depending on the oil composition).

Good to know! Never use plastic drink bottles for storing and mixing the fuel mixture. Gasoline corrodes plastic. And even if the sides of the bottle seem to be intact, harmful components will enter the fuel mixture and with it the engine. This is very bad for the carburetor.

Wearing gloves is recommended to protect your hands from the gasoline and oil. Also remember the elementary rules of fire safety. Mix the fluids outdoors so that petrol fumes do not accumulate indoors. Do not smoke while working and avoid other factors that can cause ignition of fuel and lubricants.

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Pour the prepared fuel mixture into the fuel tank and close the cap tightly. If you have made more mixture than you can use at one time, pour it into a separate canister for storage or leave it in the mixing tank. Most importantly. close the cap tightly. The ready-to-use mixture can be stored for up to two weeks and can be refilled without risk to the engine. The only condition. do not leave it in the fuel tank. If you will not be using the tool for an extended period, use up all the leftovers or drain it.

Now you know how to dilute gasoline for a chainsaw so as not to harm the engine. Try to do it yourself. After you have made the fuel mixture a few times, you will know how many components are needed so that there is no excess mixture. You can buy everything you need in our online store. With brand-name oils your tool will last a long time.

The consequences of the wrong dosage

Many chainsaw users don’t give proper attention to the proportion of oil in their engines. 50 grams more or less. it makes no difference? And in vain: the cause of chain saw malfunctions is often the use of an incorrectly mixed fuel. And it is possible to make a mistake or deliberately violate the oil ratio either upward or downward.

If there’s a lot of oil.

There is an opinion among chainsaw owners that “you can’t spoil an engine with oil”. But it is not for nothing that the necessary parameters of the ready mixture are invented. Too much oil can also be harmful and inconvenient. After all, despite the improved combustibility without residue, some of the hydrocarbons still turn into soot and soot. If the oil concentration is too low, it is too low, but if you mix twice as much oil as usual, you get coking. This is especially dangerous for cheap mineral oils, which have no “flushing” effect.

You’re also very likely to find oil in the air filter if you overfill the carburetor. the spark plug will also be in soot. it will need to be cleaned, flushed and dried. Also the vapors of unburned oil will settle in the muffler, and with intensive work will burn out, forming a plume of soot and sparks.

After such refueling almost all insides of the saw have to be thoroughly cleaned and rinsed. The most cheerful “surprise” is piston rings dying. but that’s if you overdo it regularly and work under a big load.

or little

“Greedy” cooking of the fuel mixture has killed more than one piston. That’s where it’s really better to be “too much” than “not enough”. After all, if in the first case you are threatened by a thorough “washing” unit, the second will have to change the cylinder head, and it is in many saws generally unprofitable, but for others is very decent money.

Conclusion: economy makes no sense. If there is not enough oil, the piston starts to grind heavily on the cylinder, because at high temperature gasoline is too fluid to perform the lubrication function.

The sad outcome: scoring on the piston and a ruined saw engine. If the owner comes to his senses in time, he will find that the piston and cylinder turn a beautiful blue. No master can guarantee how long they will last.


Stricter criteria for selecting an oil component. At best, it is a manufacturer-recommended mineral or semi-synthetic engine oil designed for high-speed, air-cooled two-stroke engines.

Mineral oils have the advantage of lower cost. Their more expensive semi-synthetic and synthetic analogues are advantageously distinguished by improved performance and compliance with environmental standards.

dilute, gasoline
  • retain their performance over a wide range of operating temperatures;
  • do not form soot;
  • STIHL chain saws have detergent, anti-oxidant, preservative and other additives that are useful for power unit operation.

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What kind of gasoline to put in your STIHL chain saw??

According to the experts, it is necessary to use unleaded gasoline, obtained by adding lead-free additives, the octane number of which exceeds 90. For foreign models it is necessary to use higher brands of gasoline and branded oils of the tool manufacturers. The ideal fuel is AI-92. How to fuel a STIHL 180 chain saw? In this case the oil is meant in a 1:40 mixture. It is quite suitable for it and fuel AI-95, but according to professionals it is better for chainsaws do not apply.

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The fact is that it is made on the basis of AI-92 with the use of certain additives that change the quality of the fuel. These components deposit on the inner parts of the tool and when they reach a critical mass, they begin to flake off, disrupting the operation of the mechanism. The best option is to follow the instructions that come with the selected model. Use fresh gasoline is recommended, as it loses its octane properties when stored for too long in containers.

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Overview of internal combustion engine oil manufacturers

STIHL lubricant “STIHL” is one such oil that is used directly for chain saws. They are available in 5-litre bottles and canisters in the stores. This type is referred to as mineral. They have a cheap selling price. However, they are of lower quality than synthetic oils.

dilute, gasoline

Synthetics retain their lubricating properties for a long time. They are capable of not burning out after the first heating up when the temperature increases. Do not emit toxic substances that can harm the health of the owner.

Husqvarna lubricant is used to lubricate chainsaw engines of the same company. It should be diluted in petrol at a ratio of 1:50. Or 20 grams per liter of gasoline. Engine lubricant from other manufacturers should be diluted in the ratio of 1 to 33. i.e. 30 grams per liter of gasoline. This fuel diluent consists of seventy percent mineral elements. Synthetic additives are also added. But their share is small. 30 percent. This grease is intended for the CIS countries, where there are problems with high-quality gasoline.

“Kreissman, an example of which was mentioned above, is used for two-stroke chainsaw engines. Dilute the oil with fuel in the same proportions described above. “Kreissman prevents the formation of carbon deposits, perfectly lubricates pistons and other engine parts.

Tool manufacturers usually equip chainsaws with their own lubricant. In this way you get the best ratio of lubrication properties and increase the service life of your chain saw.

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The chainsaw is started with the engine running on a mixture of gasoline and oil adapted to the environment. Maintain correct oil to gasoline ratios in your chainsaw so you get a stable chain saw’s performance. To get high power the saw is used in high engine speeds. That’s why higher requirements are imposed on the quality of lubricant and fuel.

Preparing the fuel mixture: the proportion of oil and gasoline for a chainsaw

The chainsaw engine is the heart of the machine, and mixing the right fuel is very important.

Gasoline and oil mixture for chain saw is made of two parts. oil and gasoline. Chainsaws are equipped with two-stroke engines, so oil is not added to the lubrication system (as in a four-stroke engine), but directly to the gasoline. In doing so it is very important to respect the correct proportions of ingredients and, of course, in no case trying to work on pure gasoline, because that way you will very quickly “kill” the chainsaw.

The oil must necessarily be intended for two-stroke engines of gardening and forestry equipment (that is, under no circumstances can you use oil for boat motors or scooters). As practice shows, such oil can be bought in any store or service center, where chainsaws are sold or serviced.

dilute, gasoline

If we talk about what gasoline to fill a chainsaw, it would be optimal to use fuel with the octane number of A-95, in this case, the savings on fuel can turn out badly. Often European manufacturers specify that it is possible to use gasoline A-90 or A-92, but in post-Soviet countries the quality of gasoline is inferior to European, so in our realities it is better to use high-quality gasoline.

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As for the ratio of the gasoline-oil mixture itself, everything is simple: you must clearly follow the instructions of the tool. All chainsaw manufacturers indicate the necessary ratio in the instruction manual or in the passport of the tool, moreover, the proportions for filling the chainsaw may differ depending on the model of chain saw. as a rule, ratio of oil to gasoline of famous manufacturers’ chainsaws is 1:40 or 1:50, which means one part of oil to, for example, 40 parts of gasoline.

Now the arithmetic: 1 liter of gasoline = 1000 ml of gasoline, divide by 40 and you get 25 ml of oil. If you perform the same actions to the ratio 1:50, we get 20 ml of oil per 1 liter of gasoline.

As for the budget Chinese-made chainsaws, the situation is slightly different. Gasoline to oil ratio for a chainsaw made in China 1:25, that is 1000 ml of petrol divided by 25, you get 40 ml of oil. The thing is that in brand-name chainsaws the quality build and the distance between the pistons and cylinders in the engine is much smaller than in Chinese chainsaws, so the required amount of oil is almost twice as much different.

In order to measure the correct portion of oil, use an ordinary medical syringe of sufficient volume.

One more thing to note. When the canister is dry, pour the gasoline in first and then the oil in second. The procedure on the contrary is fraught with poor quality fuel mixture, because the oil is denser, will stick to the bottom of the canister. That is why a good blending is out of the question.

Always prepare a fuel mix in a canister and fill the tank with already prepared special fuel! Never prepare and mix it directly in the chainsaw’s fuel tank!

If with the question of how to dilute gasoline for a chainsaw figured out, then and about the storage conditions and expiration dates of the fuel mixture worth saying a few words. It is best and easiest to prepare gasoline-oil mixture for 1 liter of gasoline, it is recommended to do it just before working with the tool. The fuel tanks of chainsaws have a volume of 0.3 to 1 liter. In terms of domestic use, the entire volume of the prepared fuel mixture is rarely used in a single session, so the remainder can be saved until the next work session. It is necessary to store the fuel mixture in a special canister for gasoline, in a dry, dark place. It is optimal to calculate that storage time of the ready mixture will be 7-10 days

The fact that the oil currently on the market is not synthetic, but organic, that is natural. After 10 days all lubricating properties are lost, gasoline simply “eats” the oil. Naturally, you can not use such fuel anymore, it can cause a breakdown and failure of the chainsaw.

At the end of the work it is necessary to drain the fuel mixture and start the chainsaw. the tool will stall (in order for the saw to have a dry carburetor) and now you can leave it until the next session of operation.

Peculiarities of running-in of the new tool

This includes sparing the chainsaw during the initial phase of its operation. The technology also provides for running the engine on a mixture with 20% more engine oil.

For information on hourly running-in time, see the owner’s manual. In practice it is enough to fill up the gas tank 3-5 times for the tool to reach the working level.

New models do not need a running-in period, but it is not recommended to use the chain saw with heavy loads for the first hours of operation.

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