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Using the correct fuel mix can extend the life of your STIHL trimmer and prevent unnecessary repairs

03/20/2026
Get the fuel right!

When it comes to maintaining your petrol grass trimmer, one of the most important — yet often overlooked — factors is the fuel mix.

At Gayways Ltd, we regularly see machines come in for servicing that are suffering from issues caused simply by incorrect fuel ratios. While it might seem like a small detail, getting this wrong can lead to poor performance, increased wear, and even long-term engine damage.

What Is the Correct Fuel Mix?

Most STIHL petrol grass trimmers operate on a 50:1 fuel-to-oil ratio.

This means:

  • 50 parts petrol
  • 1 part high-quality 2-stroke engine oil

Using the correct ratio ensures that the engine is properly lubricated while still running efficiently.

What Happens If You Get It Wrong?

Incorrect fuel mixtures are one of the most common causes of avoidable damage.

Too much oil can lead to:

  • Excess smoke
  • Carbon build-up
  • Reduced performance

Too little oil can cause:

  • Overheating
  • Increased friction
  • Serious engine damage

In many cases, this results in costly repairs that could have easily been avoided.

How to Get It Right Every Time

To ensure your machine runs smoothly:

  • Always use fresh, high-quality petrol
  • Use the correct STIHL 2-stroke oil
  • Measure carefully when mixing fuel
  • Avoid storing mixed fuel for long periods

For many users, a simple solution is switching to ready-mixed fuel, which removes any guesswork and ensures consistent performance.

Why This Matters

Your grass trimmer is an investment, and proper fuel mixing plays a key role in keeping it running efficiently over time.

A well-maintained machine:

  • Performs better
  • Lasts longer
  • Requires fewer repairs

Need Advice or Help?

If you’re unsure about the correct fuel mix for your machine, or if your trimmer isn’t performing as it should, our team is here to help.

At Gayways Ltd (www.gaywaysltd.co.uk), we offer:

  • Expert advice
  • Servicing and repairs
  • Genuine STIHL parts and accessories

Pop in-store or get in touch — we’re always happy to help.


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