What is the Right STIHL Chainsaw Fuel Mix?
Your STIHL chainsaw requires a precise mixture of petrol and engine oil for optimal performance. Here are the correct products to use and the proper mixing ratio to keep your equipment running at its peak.
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.
Mixing Your Own Fuel vs. Ready-Mixed
Mixing your own: use a certified fuel container. Add oil first, then petrol, and shake to combine. Handle carefully when opening to avoid spillage.
Ready-mixed: STIHL MotoMix is a convenient pre-mixed solution with high-quality oil, offering long shelf life and optimal engine performance.
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.
Using E10 Petrol
Petrol with up to 10% ethanol is generally safe for STIHL chainsaws and compatible tools. In rare cases, carburettor adjustments may be needed — please get in touch with us if required.
Fuel Checklist & Refuelling Safety
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.
Refuelling safety:
- Keep away from flames and smoke.
- Refuel at least 3 metres 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, Shelf Life & Incorrect Fuel
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.
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.
Fuel Mix Video Guide
Recommended Products
STIHL MotoMix Ready-Mixture Fuel
Premium ethanol-free premixed fuel (50:1 ratio) for optimal performance and engine protection.
View Product
STIHL HP 2-Stroke Engine Oil Mix
Top-quality 2-stroke engine oil designed for mixing at the correct 50:1 ratio with petrol.
View Product
STIHL Mixing Bottle 1L
Designed for accurate fuel and oil mixing — measure, mix and pour safely for the correct ratio every time.
View ProductDo chainsaws need a petrol and oil fuel mix?
Yes, all petrol-driven chainsaws require a 50:1 petrol-to-oil mix. Using the wrong ratio can cause engine damage.
What is the correct fuel mix for my STIHL chainsaw?
The recommended ratio is 50 parts petrol to 1 part engine oil, preferably STIHL 2-stroke engine oil. For 5L of petrol, use 100ml of oil, or use ready-mixed STIHL MotoMix.
What is the best fuel for chainsaws?
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.
Which engine oil should I mix with petrol for a chainsaw?
Only use high-quality 2-stroke engine oil with TC classification. We recommend STIHL 2-stroke engine oil for long-lasting engine performance.