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The right fuel mixture for your petrol linetrimmer or brushcutter

What’s the right grass trimmer fuel to use? 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.

21.08.2024

A man filling the fuel tank of a STIHL grass trimmer from a large bottle with shrubs behind him

THE RIGHT MIX RATIO FOR YOUR LINETRIMMER

It’s important to power your linetrimmer or brushcutter with a fuel mixture made to the right recipe: unsuitable fuels and the wrong mix ratios can cause serious damage, leading to piston seizure, excessive wear, and ultimately a shorter lifespan for your linetrimmer. The mix ratio you need to remember when making up fuel mixture for your trimmer is: 

WHEN USING STIHL 2-STROKE ENGINE OIL 

1:50 = 1 part oil + 50 parts petrol 

WHEN USING OTHER PRODUCTS

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 grass trimmer fuel mixture as with the STIHL engine oil:

1:50 = 1 part oil + 50 parts petrol

A man pours STIHL HP 2-stroke engine oil into a measuring beaker

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. 

WHAT TYPE OF PETROL SHOULD I USE IN MY FUEL MIXTURE?

Use high-quality petrol for best performance. 
A collection of canisters including a bottle of STIHL HP Super 2-stroke engine oil and an orange combination canister

WHAT TYPE OF ENGINE OIL SHOULD I USE IN MY 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 your fuel mixture in a vessel that is approved for use with fuels. 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 linetrimmer or brushcutter tank. Carefully open the canister, in case pressure has built up inside. 

How to mix your own fuel for STIHL tools

Using unsuitable fuel or an inappropriate mix ratio could damage your linetrimmer. 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 STIHL tools and guarantees high performance and a long service life.

OPERATING INSTRUCTIONS FOR YOUR STIHL lineTRIMMER

Find and download the operating instructions for your STIHL linetrimmer here. 

SUMMARY: LINETRIMMER FUEL MIXTURE 

  • Using the right fuel mixture in your linetrimmer or brushcutter protects it from damage such as piston seizure 
  • We recommend using STIHL 1:50 2-stroke engine oil with petrol, at 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 linetrimmer and brushcutter – 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 

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