The right fuel mixture for your petrol grass trimmer or brush cutter
Your petrol grass trimmer runs on a fuel mixture made up of petrol and engine oil. Use the correct mix ratio to keep tools at their best for years to come.
02.10.2024
The right mix ratio for your grass trimmer
It’s important to power your grass trimmer or brush cutter with the correct fuel mixture. Unsuitable fuels and the wrong mix ratios can cause serious damage, leading to piston seizure, excessive wear, and ultimately a shorter lifespan for your grass trimmer. The mix ratio you need to remember when making up 2-stroke fuel for your trimmer is:
STIHL 2-stroke engine oil
1:50 = 1 part oil + 50 parts petrol
Third party TC 2-stroke engine oil
Any other two-stroke oil you use in your grass trimmer must have the TC classification and be in accordance with JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-LEGD. Use the same ratio for your fuel mixture as with the STIHL engine oil:
1:50 = 1 part oil + 50 parts petrol
Working out proportions
Example fuel mixture proportions
You can achieve a fuel mix ratio of 1:50 with 5 l of petrol and 0.1 l (100 ml) of oil, STIHL two-stroke oil.
What type of petrol should I use in the fuel mixture?
What type of engine oil should I use in the fuel mixture?
You should only use high-quality oil for 2-stroke engines, that meets the requirements for TC classification. We recommend STIHL 2-stroke engine oil, which is specially formulated for STIHL tools and will prolong the life of your grass trimmer.
Caution: Inferior products can damage the engine, sealing rings and fuel tank of your trimmer.
Information on mixing: Make up your grass trimmer fuel mixture in a vessel that is approved for use with fuels – STIHL sells combination canisters that are ideal. Pour in the oil first, followed by the petrol; seal the canister and give it a good shake to combine the fuel mixture. Now you’re ready to use the fuel mixture in your grass trimmer or brush cutter tank. Take care as you open the canister, in case pressure has built up inside.
Operating instructions for your STIHL grass trimmer
Find and download the operating instructions for your STIHL grass trimmer here.
STIHL grass trimmer fuel mixture
The right fuel mixture for your grass trimmer – no mixing required
Using unsuitable fuel or an inappropriate mix ratio could damage your grass trimmer. The easy way to give your STIHL tools the best treatment is by opting for STIHL MotoMix fuel, a premixed fuel mixture that contains no ethanol, is specially formulated for our tools and guarantees high performance and a long service life. Contact your dealer directly if you have any questions.
Summary: grass trimmer fuel mixture
- Using the right fuel mixture in your grass trimmer protects it from damage such as piston seizure.
- Use a mix ratio of 1:50 – 1 part oil to 50 parts of petrol.
- If you’re using a different brand of oil, make sure it has the TC classification. The same mix ratio of 1:50 applies.
- STIHL MotoMix is perfect for your petrol grass trimmer – it’s an ideal fuel mixture that is already blended and specially formulated for the engine. It creates low emissions with high performance and boasts a long shelf life.
