Chainsaw Fuel Mix Guide

Using the correct fuel mixture is essential for the performance and longevity of your chainsaw. Always use high-quality ingredients and follow the correct ratios for safe and efficient operation.

Learn more about STIHL MotoMix, the ready-mixed option for hassle-free chainsaw fuel.

Overview: Chainsaw Fuel Mix

Use good quality ingredients in your petrol-oil mixture.
Maintain the proper ratio: 1 part engine oil to 50 parts petrol for 2-stroke engines.
E10 petrol is suitable for all STIHL tools.
Homemade fuel mixes are only stable for up to 30 days.
STIHL MotoMix provides a reliable pre-mixed solution for chainsaws.

Frequently Asked Questions

Yes, all petrol-driven chainsaws require a 50:1 petrol-to-oil mix. Using the wrong ratio can cause engine damage.

The recommended ratio is 50 parts petrol to 1 part engine oil, preferably STIHL 2-stroke engine oil. For 5 L of petrol, use 100 ml of oil, or use ready-mixed STIHL MotoMix.

Use high-quality fuel with a minimum octane rating of 90 RON. UK unleaded petrol is typically 95-98 RON and suitable for STIHL chainsaws, including E5 and E10 variants.

Only use high-quality 2-stroke engine oil with TC classification. We recommend STIHL 2-stroke engine oil for long-lasting engine performance.

The Importance of Using the Right Fuel Mix

Incorrect fuel ratios can damage the engine, cause piston seizure, and shorten the life of your chainsaw. Always follow the recommended 50:1 ratio for STIHL 2-MIX and 4-MIX engines.

Mixing Your Own Fuel

Use a certified fuel container. Add oil first, then petrol, and shake to combine. Handle carefully when opening to avoid spillage.

Ready-Mixed Fuel

STIHL MotoMix is a convenient pre-mixed solution with high-quality oil, offering long shelf life and optimal engine performance. Learn more here.

Chainsaw fuel being poured from a combination canister

Using E10 Petrol

Petrol with up to 10% ethanol is generally safe for STIHL chainsaws and compatible tools. In rare cases, carburetor adjustments may be needed; please get in touch with us if required.

Fuel Checklist

Use high-quality 2-stroke engine oil.
Mix at 1:50 ratio.
Use approved fuel containers and shake well.
Refill chainsaws carefully to avoid spills.

Safety Tips for Refuelling

Keep away from flames and smoke.
Refuel at least 3 meters away from the working area.
Never fill a hot engine tank.
Close the fuel cap carefully to release pressure safely.
Always operate in well-ventilated areas.

Storage and Shelf Life

Homemade fuel mixes degrade quickly due to oxygen and moisture, leading to resinous deposits and engine issues. Avoid storing self-mixed 2-stroke fuel for more than 30 days.

Incorrect Fuel Usage

If the wrong fuel is used, do not operate the chainsaw. Empty the tank into a safe container, refill with correct fuel, and check the spark plug if necessary.