STIHL chain saw oil to gasoline ratio

The correct oil ratio for a brushcutter and chain saw

Many users of gasoline power tools have an irresponsible attitude to mixing the fuel. For example, I met the owners of saws that dilute gasoline with oil “by eye”. They just shed as much as they want and then come back to me with faulty tools.

It is important to understand that more, as well as less, does not mean better. It is the golden mean.

If you make a mixture with a lack of oil, it’s all clear. Not enough lubricant in the cylinder and bearings, resulting in higher friction, higher temperatures, scoring in the cylinder and possible seizure in the crankshaft bearings.

But what happens if you overfill? The large volume of oil, when burned, produces many residual products of combustion that deposit on the piston, cylinder exhaust window and muffler, making it difficult to move the exhaust gases. As a result, power loss or complete lack of performance.

The sludge that is formed by too much oil can deposit under the compression rings, not allowing them to compensate for thermal expansion, which leads to scuffing, in general, the consequences can be quite serious.

Choosing an oil for chain lubrication

Remember to check the oil level in the oil tank each time you refuel your chain saw. The chainsaw’s oil pump is the source of grease for the bar that the chain slides on. Normally you fill both fuel and oil containers at the same time. Chain oil should be poured into the appropriate tank up to the neck. Otherwise, it could run out before the fuel runs out and cause the chain and tire to overheat.

Chain oil for chainsaws should be designed specifically for this purpose. Using other lubricants is ineffective and reduces not only the life of the saw, but also the life of the machine’s bar. This is because chain oil has adhesive agents in its composition, thanks to which the lubricant literally “adheres” to the chain. This property of oil reduces oil consumption, resulting in better lubrication of the chainsaw bar and saw chain, increasing their service life.

Another important parameter of chain lubricant is its density. If you are going to use a lubricant that is not designed for chainsaws, you may notice that oil leaks when the machine is running or after it has stopped. This is an indication that the grease is too thin. In addition, liquid lubricant will quickly disperse in all directions and, accordingly, quickly run out.

If you use a chain saw in the winter, you have to use oil designed for low temperatures in order to lubricate the chain or the oil pump will fail. Therefore, the grease remaining in the tank must be replaced with low-temperature grease.

Leading chainsaw manufacturers like STIHL, Husqvarna, Makita, Bosch and Oregon chain saw component makers recommend special highly adhesive oils including biodegradable oils. But the oils of famous brands have the only disadvantage. for 1 liter and more. In addition, the grease in the tank over time can thicken and clog the channels. For this reason it has to be drained and this increases consumption. In spite of this, it is a fact that only the use of special lubricants can extend the life of a chainsaw.

How to dilute the oil with gasoline for two-stroke engines?

They are specified in the form of ratios. 1:50, 1:40, 1:25, and so on. Any of these proportions tells how much oil to pour on the volume of fuel. For example, to prepare a mixture in proportion 1:25, you will need 1 liter of oil for 25 liters of gasoline.

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The consequences of wrong dosage

Many chainsaw users don’t give proper attention to the mix ratio. 50 grams more or less. does it matter?? And in vain: often the cause of saw malfunctions is operation with an improperly prepared fuel mixture. It is possible to make a mistake or intentionally breach the ratio both upwards and downwards.

If there is a lot of oil.

There’s a popular saying among chainsaw owners that “you can’t go wrong with oil”. But the necessary parameters of ready mixture are invented for a reason. Too much oil can also be harmful and inconvenient. In spite of its improved residue-free combustibility, some of the hydrocarbons will still turn into soot and carbon residue. If you don’t have a lot of oil, but if you double the oil concentration you get cinder blockage. It’s especially dangerous for cheap mineral oils that don’t have a “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 have to be cleaned, flushed and dried. Also the vapors of unburned oil will settle in the muffler, and at intensive operation will burn out, forming a plume of soot and sparks.

After such refueling almost all the insides of the saw will have to be thoroughly cleaned and flushed. The funniest “surprise” will be “dying” of piston rings. but that’s in case of systematic abuse of oil overflow and running under a heavy load.

or little

than one piston has been killed by “greediness” in the fuel mixture. Here’s where it’s really better to be overdone than underdone. After all, if in the first case you are threatened by a thorough “washing” of the unit, in the second case you will have to change the cylinder head, and this is unprofitable in many saws, and for others costs a pretty penny.Conclusion: saving money is useless. If you do not have enough oil, the piston rubs heavily on the cylinder, because at high temperature, gasoline is too fluid to perform the lubrication function.

Tragic results: Scored pistons, ruined saw engine. In case the owner will come to his senses in time, he will find that the piston and cylinder cast a beautiful blue. No mechanic can guarantee how long they will last.

Answers to Frequently Asked Questions

Let’s briefly answer the most common questions chain saw owners ask.

Can I put motor oil in my chainsaw??

Yes, you can. Once for simple tasks without serious stress. For example, let’s imagine the following situation.

The piston of a 2-stroke engine after running in depleted lubrication

It is not originally planned to do any work using a chain saw. That’s why no special 2T lubricant was purchased in advance.

But when you arrive at the cottage, you find that, for example, a tree has fallen on the fence. And it needs to be stripped and cleaned up right away. In this case, you can use one-time motor lubricants.

The Consequences of Using Regular 4-Stroke Engine Oil for a Long Time

How much oil is needed for the chainsaw in this case??

It is recommended to fill 30-50% more grease. The saw will smoke more, but the likelihood of damage to the piston will be reduced. For example, it would be better to take 2.5 to 3 grams of oil per 100 grams of gasoline. The basic idea here is: Better for the saw improper lubrication than no lubrication at all.

Choose synthetic, semi-synthetic or mineral oil?

Here again, everything depends on the type of saw and its design purpose, as well as the nature of the work. If the saw is used in industry for sawing thick logs or hardwood and not at home (domestic use) it might be better to use synthetic or semi-synthetic in the long run.

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Rules of oil selection for chainsaws and brushcutters. video

But if your chain saw is used for household purposes, ordinary mineral oil will do.

How to mix gasoline and oil?

There is no exact technology for the mixing procedure itself (not the proportion), which must be strictly adhered to. Usually an empty container with a measuring scale is taken, and gasoline is poured into it.

For example, 1 liter. After that, the lubricant is added. To get the desired lubricant, use a syringe or measuring cup with a scale value of 1 ml. The mixture is thoroughly mixed and poured into the saw.

Not recommended this method, how to dilute oil with gasoline immediately in the fuel tank of the grass saw. Especially if the tank was previously completely dry. After pouring gasoline into the tank, it flows into the fuel system without oil.

That means that after adding oil the saw will run dry for some time after starting. And this is just at the moment of starting and warming up, when the engine needs protection the most.

What’s the best chain saw oil for gasoline??

There is no definite answer to this question either. It all depends on the design features of the chainsaw and the mode of its operation. In any case, the win-win option will be to buy branded oil from the manufacturer of the saw.

In general, the tendency is as follows: the more expensive the lubricant, the more it protects the engine from wear and the less it deposits in the cylinder.

Today you can find fake chainsaw oils on sale, which are at best a tinted spindle.

The probability of buying a fake product in large specialized stores is minimal. Such outlets value their reputation and almost never deal with counterfeit products.

Oil for two-stroke chainsaw engines

Modern garden chain saws can be equipped with 2- and 4-stroke power units. These two engine types have slightly different operating principles and use of added lubricant. Powerful chainsaws with 4-stroke internal combustion engines have an engine crank group lubricated by oil, which is in the crankcase of the factory engine during the active work of the gasoline tool. The lubricant in the factory engines is taken from the gasoline directly to the cavity located under the regular piston. this is where the crank group is located and equipped with a pair of bushings and bearings that require continuous lubrication. That’s why you need to add engine oil to the gasoline used for filling 2-stroke factory engines.

Important Characteristics of Operating and Mounting Single Girder Overhead Cranes of Pillar and Hanger Design

In order to choose a specific lubricant for the chain saw’s continuously lubricating engine parts, the chain saw owner should study the most important properties of the material:

  • Amounts of ash produced. combustion of gasoline produces exhaust fumes, and combustion of oil produces ash and resinous deposits. They accumulate on the walls of the cylinder and piston, making it difficult for it to move up and down unimpeded. Some manufacturers do not guarantee adequate grease combustion, but branded products burn almost completely;
  • level of purification from foreign substances. oils may contain not only useful additives, but also harmful substances. A quality lubricant is considered to be one in which the percentage of harmful components is minimal;
  • anti-wear, anti-corrosion and continuous lubricating properties. the oil must cover the rubbing parts of the power unit with a thin film, thus protecting them from increased wear, heating and the effects of rust.

When developing lubricants to keep 2-stroke engines running, manufacturers focus on two standards: 2T and TC-W3. Oil of the second type is used for conventional engines, equipped with liquid cooling. such engines are equipped with jet skis and boat engines. 2T oils are mainly used for the lubrication of air-cooled chain saws, trimmers and other appliances.

On the market the most popular among experienced gardeners and woodcutters are oils of such brands:

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Husqvarna. The Swedish manufacturer never skimped on quality. Direct proof of this is not only branded garden equipment, but also high-quality products for the lubrication of its parts. Oil of this brand. Husqvarna HP. contains a large number of additives aimed at stabilizing the work of the engine. This oil is produced on a carefully prepared semi-synthetic base and has components that reliably protect the powertrain from corrosion and increased wear. During continuous operation, the Swedish manufacturer’s oil burns almost completely, producing minimal ash;

  • STIHL is the world’s best-known brand for gardening equipment. The lubricants in this brand have a balanced proprietary formula that contains all required additives. STIHL HP oils are capable of operating the saw in ambient temperatures up to.10⁰C;
  • Partner. this chainsaw manufacturer oils are compatible with all 2-stroke power units. They stand out for their enhanced lubricating properties, high level of anti-corrosion and anti-wear additives, as well as the ability to operate stably at temperatures up to.15⁰C.

When selecting oil for 2-stroke chainsaw engines it is important to pay attention to its expiration date. Gardeners should be alert to the manufacturer’s notes that its lubricants can last for 3-5 years or more. After all, the additives in the oil tend to evaporate and lose their essential working properties

As a rule, well known brands advise to use their lubricants for 6-12 months, because after this time the oil becomes worthless

The additives in the oil tends to evaporate and lose their basic performance properties. As a rule, well-known brands advise to use their lubricating products for 6-12 months, since after this time the oil becomes worthless.

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

STIHL 180 chain saws with improperly mixed fuel and lubricants and inadequate proportions when adding oil to gasoline causes the following problems:

  • Increased friction increases wear on the working surfaces of the parts.
  • Insufficient lubricant will cause the bearings to deteriorate.
  • Complete functioning of mechanical units is impaired due to premature wear of details, their service life is considerably reduced.
  • The use of lower-grade gasoline and oils reduces the performance of the machine and then damages important components and parts.

Fuel must be prepared before the filling of the saw, avoiding its excessive contact with oxygen. After finishing work, it is necessary to pour out the remaining mixture.

Gasoline for chain saw

For domestic gasoline-powered saws (Ural, Druzhba, etc.).) gasoline brand AI-80 is used. Oils can be used domestic, such as M8-B (or early marking AC-8.10), M-12 TP, M-12TPU, MGD-14M. It is also possible to use oils from foreign manufacturers. In any case, the proportions when mixing oil and gasoline should be 1/25, that is, one hundred grams per two and a half liters of gasoline. For modern chainsaws from foreign manufacturers, the proportions are usually 1/40 (100 grams per 4 liters of AI-92), 1/50 (100 grams per 5 liters of AI-92). Use gasoline of AI-92 grade. You can often see that the instructions will indicate the brand AI-95. But given the quality of our gasoline, the octane number of which is increased by additives, I would not recommend the use of 95 if you are not sure of its quality.

about the proportions of the mix:

You can use a syringe, a measuring bottle, a special dispenser or, for example, a STIHL dispenser bottle to measure the required amount of oil. Different colors of oil from different manufacturers. As you can see in the photo above STIHL oil is red (mineral) and the more expensive synthetic oils are green. Husqvarna oil can be green or blue.


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