How to dilute oil and gasoline for a chainsaw

The right oil to gasoline ratio for a chainsaw

Hi all! In this article we will talk about the right oil to gasoline ratio for a chainsaw. This is probably the most important thing to know when operating this machine. Lack of oil will cause unnecessary friction, and too much oil will cause excessive fouling and overheating. In the end, both will lead to a rapid engine failure. Repair can cost half the price of a new chain saw.

In addition to the correct proportions we will talk here about other important things that will maximize the life of your chain saw. what gasoline to use, what oil to pour, how to dilute it, the storage time of the mixture, etc so I advise you not to quit reading the article after the section on proportions, because further there will also be information that will be useful to you.

Husqvarna chainsaws: device, malfunction and repair, model review

Husqvarna gasoline-powered saws are in great demand among beginning gardeners and experienced woodcutters alike. The models of the Swedish brand possess a number of such fundamental advantages as reliability, balance and the highest operating resource. In all of this, every Husqvarna chain saw has a simple design that makes it easy to service and fix the problem on the spot.

How to adjust the carburetor on the chain saw Husqvarna?

In case the chain saw Husqvarna does not start or it does not develop revolutions. the reason for this lies in the violation of industrial carburetor options. For that the tool has 3 screws marked “H”, “L” and “T”.

To tune your Husqvarna chain saw, proceed as follows:

  • Carburetor adjustment begins with a 5-minute warm-up of the saw’s motor. Then start to turn the “L” screw until you hear the most rpm coming from its motor. Then turn the screw immediately a quarter turn in the opposite direction;
  • Then use one hand to squeeze and hold the throttle trigger for 10 seconds. Turn the screw “H” a quarter turn with the 2nd hand to make the critical load on the motor;
  • Then release the throttle trigger and start to turn the “T” screw in the direction of the arrow. As the chain begins to turn on the bar, turn the screw to the opposite side until the chain stops.

Husqvarna 257 XP and Husqvarna 455 Rancher chainsaws

These Husqvarna chain saws are great for cutting small logs and limbing old growth. Chainsaws have the following performance numbers in the table below.

Chainsaw model Husqvarna 257 XP Husqvarna 455 Rancher
Power 3,7 л. с./2700 Watt 3,5 л. с./2600 Watt
Standard bar size 45 cm 45 cm
Fuel replenishment reservoir 600 ml 440 ml
Lubricant reservoir 350 ml 320 ml
Weight in ready-to-use form 5,5 kg 6.1 kg

The power of these models is fully sufficient in order to own hands to make an ice drill from a chainsaw or other useful household tools.

What oil is right for your Husqvarna chainsaw??

Husqvarna chainsaw parts can be used for quite a long time, provided that the tool owner will not skimp on motor oil.

Mineral or synthetic oil can be used to dilute the refueling consistency. The second option is always more expensive and has a much better effect.



Engine manufacturers recommend the use of high-octane gasoline AI-92, 95. Do not use fuel with various additives to increase the octane rating. Over this time it may undergo tarring and polymerization, which can impair engine performance.

We do not recommend the use of gasoline that has been stored for more than 60 days

Most chainsaw engines are designed to use leaded gasoline. If you have purchased an instrument with a catalytic converter (the tank lid will be green), we recommend unleaded gasoline.

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The high-octane gasoline recommended in the Economy section is not to be used for fuel under 90 octane. Also use of gasoline with an octane rating higher than 95 is not recommended. This leads to premature wear of the engine piston group.


Air-cooled two-stroke engines are not designed with a separate lubrication system. Lubrication of moving parts is accomplished with oil in the fuel mixture. That’s why it is essential to use only high-quality oils from trusted manufacturers.

Recommended oils for filling your chainsaw:

  • STIHL HP. developed specially for chainsaw engines. Has proven itself in all weather conditions and guarantees perfect engine performance.
  • Husqvarna HP. oil from a well-known manufacturer of gardening equipment. Special additives reduce engine crankcase fouling that can occur due to the use of poor-quality fuel.
  • Oleo-Mac Prosint 2T is a multifunctional oil with synthetic esters. Protects engine parts from corrosion, reduces wear of machinery and parts.
  • Champion JASO FD. quality oil from a well-known company. Provides good protection for all moving engine parts;
  • Vitals Semisynthetic is an oil for chain saws of low-cost models, suitable for use at temperatures starting from.20°C.Do not use mineral oils, semi-synthetic or synthetic car oils.

Important: Do not use mineral, semi-synthetic or synthetic motor oil. They are designed for a different type of engine and do not have the necessary properties.

For gardening equipment, it is recommended to buy unleaded gasoline. Otherwise there is a risk of engine failure. Manufacturers recommend a fuel with an octane rating no lower than Ai-90, preferably Ai-92 or Ai-95. For individual recommendations for your tool, see the instruction manual. Fill the canister with the amount of fuel you need at the gas station. It is desirable to take a metal: in such a container does not arise static electricity from friction, which increases the safety of use.

Buy branded oils for two-stroke engines, preferably API-TB or API-TC. The manufacturer should indicate the recommended brands in the tool’s instruction manual. Also take into account their composition. Mineral oils are suitable for use in warm weather. Synthetics are better, they are less viscous and can be used even in freezing temperatures. Semi-synthetic are mineral with improved qualities, versatile for any season. Please check the temperature rating on the packaging. Also pay attention to the volume. What matters is not the proportion of gasoline and chain saw oil, but how much fuel mixture you need for one filling and how often you will use the tool. If in your arsenal in addition to the saw more trimmer for the grass or benzoshnozhiteli and you several times a week use one or the other tool, it makes sense to buy a large canister of oil volume of 3. 5 liters. For several mowing in a country season, it is enough to take a 1 liter bottle.

Mixing oil with gasoline

At the beginning of work with the tool there is always a question, how much oil to add to gasoline for chainsaw or grass trimmer. It is important to remember that for two-stroke engines the ratio is 1:50, t.е. 100 ml of oil for every 5 liters of fuel. Why it is important to maintain the correct proportions? Excess oil causes carbon deposits on pistons and spark plugs, and the lack of oil reduces the lubricating power of the fuel mixture, which leads to scuffing of the piston group and increases the risk of engine damage.

The easiest way to follow the gasoline and oil proportions for a chainsaw is to use measuring jugs. They are marked with a scale that is easy to follow. Make sure the container is clean before pouring in the gasoline and oil. Avoid getting water and dirt inside. it can affect the quality of the fuel mixture. First pour gasoline up to the proper level, then add oil, also to the proper level. To mix, tilt the container several times. The fluids will quickly mix and the composition will take on a homogenous color, such as green or red (depending on the oil’s composition).

Good to know! Never use plastic drink bottles for storing and mixing the fuel mixture. Gasoline corrodes plastic. Even if the walls of the bottle seem to be intact, harmful components will get into the fuel mixture, and with it into the engine. These are very bad for the carburetor.

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

The fuel mixture you have prepared should be poured into the fuel tank and the cap should be closed tightly. If you have made more mixture than you can use at one time, empty it into a separate canister for storage or leave it in the mixing tank. The main thing is to close the cap tightly. The mixture can be stored for up to two weeks and is ready to be used for refueling without risk to the engine. The only condition is that you do not leave it in the fuel tank. If you will not be using the tool for a long time, use up the leftovers entirely or drain them.

Now you know how to dilute gasoline for a chainsaw so as not to harm the engine. Try to do it yourself. After you prepare the fuel mixture several times, it will be clear what amount of components will be needed so that there is no excess mixture. You can buy everything you need in our online store. With branded oils your tool will last a long time.

Instructions for preparing the mixture

When quality fuel and good special oil are prepared, all that’s left is to prepare the mixture:

  • Get a suitable measuring jug. Many saws come with one free of charge. The most important thing is that it has divisions and a screw cap that can be screwed on tightly. The volume should be two to three times that of the gasoline tank. This will allow you to prepare a mixture with a small reserve.
  • Using a funnel, pour petrol into a suitable container. Don’t fill up to the edge of your finger by four so you have room to shake it up later.
  • Draw a suitable quantity of oil into the syringe with the needle removed. The 20cc syringe is the easiest to use. it is just 1/50th of a liter of gasoline. Squeeze the oil out of the syringe into the container with the gasoline
  • Screw in the plug and shake the container. After you open it, the mixture should have the same pale, even color as the oil. After that you can pour it into the gas tank.

Petrol to oil ratio for chain saws

The ratio of oil and gasoline for filling two-stroke chainsaw engines of different brands is 40 to 1. This is the standard ratio, which is used not only by beginners but also by experienced sawyers. This ratio for the fuel mixture preparation is close to the ideal one, and provides lubrication of the crank mechanism rubbing parts and the piston.

Proportions for preparing a fuel mixture

This is interesting! External factors should be taken into account before mixing petroleum products. If the chainsaw is new, it requires running-in, and for this you need to add 20% more oil to the fuel than the standard values. 20% more lubricant must also be added when working with tools at low temperatures.

How much oil to put in gasoline in milliliters? The ratio of oil and gasoline 1 to 50 is 20 ml per liter. To obtain the correct mixture, pour 1 liter of petrol into a plastic bottle and dilute it with 20 ml of oil. To properly measure how much oil to pour, you should take a special measuring container, and fill it to the appropriate mark. If you plan to prepare 2 liters of fuel at once, you need to add 40 ml of lubricant to this amount of gasoline.

There are also other ratios offered by various manufacturers. The ratios do not vary greatly, but if you have read the other values in the product datasheet, this is what you should stick to. Ratio values of 1 to 1 are standardized. You should add 15 ml of oil to every 1 liter of fuel in the summertime and 20-25 ml in the wintertime. If you know the recipe for the mixture, you also have to know what kind of gasoline to put in your chain saw?

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How to Grease a Chain Saw Needle Bearing?

To reduce the load on the tool sprocket and extend its life, this part is equipped with a needle bearing. For its proper operation during intensive use of a chainsaw, the element should be regularly lubricated.

The STIHL universal fluid is the ideal solution for removing and maintaining the needle bearing. It reliably protects the bearing from wear and corrosion, but the price of this proprietary lubricant is quite high. To save money, you can use Lithol or Lithol 24 to lubricate the bearing. They are distinguished by their high viscosity, thanks to which they cover the bearing with a thin, but strong enough oily film.

You need a 5 cm3 syringe to apply the lubricant. To lubricate the part, the syringe contents must be squeezed out into the small hole located in the housing immediately above the needle bearing.

If, however, the element lubrication has not been changed for a long time, then before changing the oil, the part must be thoroughly washed. To do this, you need to remove the right side of the chainsaw body and dismantle the bearing. Then the part will need to be placed in a container of clean gasoline. After 24 hours, the bearing must be removed from the vessel and thoroughly dried. Finally the element should be reinstalled in the gasoline-powered saw.

Working proportions of the fuel mixture

The standard ratio of gasoline to oil in the fuel mixture for different models of carbureted chainsaw engines is 40:1 and 50:1. This proportion ensures proper lubrication of cranking parts and piston group as well as does not prevent complete combustion of gasoline-air mixture.

The fuel mixture can be adjusted upwards, depending on external factors. Such a need arises at the stage of running-in of a new tool, as well as at high air temperature. In that case the standard dosage of oil is increased by 20%.

In practice, it is used to increase the percentage of oil in the fuel mixture, if its characteristics do not fully meet the stated requirements. It is the sawmaker who decides for himself how much oil to use per liter of gasoline in every particular case.

How to dilute correctly?

The figures for the dilution ratio are given with such precision for a reason. That is, it does not say, “take about this or that amount of oil.”. It is impossible to observe the exact proportion by eye, so you have to use something that will measure the exact amount of oil and gasoline.

Some inexpensive chain saws usually come with a measuring jug with dots on it. As a rule, there are several scales for different proportions. Or one, if the manufacturer implies that this tank is to be used only with the saw, which it comes with. There should be two horizontal dots on this scale. The lower one shows the level to which you need to pour the gasoline. The upper one is the level to which the mixture should reach after adding oil to the gasoline.

For more accurate measuring it is possible to use a medical syringe. preferably not less than 20 ml.

In general, you pour gasoline into the measuring cup, add the needed amount of oil measured with a syringe and shake.

It is necessary to do the mixing in a separate container, not in the gasoline tank of your chainsaw. Otherwise, before the oil is diluted with gasoline, it could get into the carburetor and make it hard to start, even to the point of having to remove the carburetor and clean it.

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