Fuel Related FAQ


Fuel Related FAQ

Will a 10% (E10) blend of ethanol hurt my gas-powered STIHL product?

All STIHL gasoline-powered engines can be used with up to a 10% (E10) blend of ethanol in the gasoline/engine oil mix. We also recommend that if a unit will be left unused for more than 30 days that it be stored "dry." This means emptying the fuel tank and then restarting and letting the unit run until all the fuel is consumed and the engine stops. For maximum performance and engine life expectancy we also recommend using STIHL Ultra 2-cycle engine oil with built-in stabilizer.

Note: STIHL recommends use of fuel with no more than 10% ethanol content. Using fuel with greater than 10% ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…

What is the recommended procedure for preparing my STIHL equipment for long term storage (over 30 days)?

Only if you plan to "mothball" your lawn trimmer, brushcutter or chain saw for a longer period - say during the winter months - should you pay a little more attention to the topic of "care." This will ensure that your equipment, when required, will be ready for action. To get the equipment ready for winter, clean it first. The air filter, the cylinder fins, the spark plug and the dismantled cutting tool should be checked and cleaned (also see Instruction Manual). Metal parts should be lightly coated with oil to protect them from rust and corrosion. The spark arresting screen in the muffler should be cleaned or replaced with a new one. The fuel tank should be emptied. Run the engine until the fuel system is dry (Warning! Do not operate the throttle, run the equipment only at idle speed until the engine stops!) STIHL recommends the use of STIHL MotoMix® Premixed fuel which is pre-mixed with STIHL HP Ultra synthetic oil. STIHL MotoMix® contains no ethanol and has a storage life of up to two years. STIHL MotoMix® can be left in the machine during seasonal storage. For winter storage, a dry and, if possible, dust-free and frost-free place would be ideal. You can save space if you hang the equipment. And remember: standard pump gasoline deteriorates. To avoid problems, only purchase enough fuel that can be used within sixty days unless it is STIHL MotoMix®.

Learn more about fuel concerns.
Read more about storing your outdoor power equipment.

What is the shelf life of STIHL MotoMix® and can I store it in the unit for an extended period of time?

Can I run E15 in my STIHL units?

No. All STIHL gasoline powered engines can be used with up to a 10% (E10) blend of ethanol in the gasoline/engine oil mix.

How long can I store fuel mix if I add a stabilizer?

STIHL currently recommends that you do not store or use fuel older than 60 days, and preferably no longer than 30 days, even with a stabilizer.

Learn more about fuel concerns.
Read more about storing your outdoor power equipment.

My Dealer tells me that ethanol can affect the fuel systems in your saws. Is this true?

STIHL products can use gasoline blends with up to 10% ethanol. It is important to follow proper fuel storage recommendations with all standard pump gasoline. Improper fuel storage is a leading cause of fuel system component failures which can lead to expensive engine damage. Additional information is contained in the following links:

Learn more about fuel concerns.
Read more about storing your outdoor power equipment.

Can I use airplane fuel or racing fuel in my trimmer, blower, or chain saw?

STIHL does not recommend the use of aviation fuel in our products.

What is the difference between winter bar oil and summer bar oil?

Summer grade oil is much thicker oil designed to be used at temperatures consistently above 50 degrees F and winter grade oil is much thinner for temperatures consistently below 50 degrees F.

My instruction manual says not to run the product at full throttle for the first 2 to 3 tanks of fuel mix. Why is this?

This can cause internal engine damage. STIHL recommends that you do not run your engine at wide open throttle without a load. A blower is under a load at all times, a trimmer is under a load as long as the trimmer head is in place and the line is to the correct length, while a chain saw is under a load when the bar and chain are in a cut.