How to mix fuel for a chainsaw

Difficulty: Easy10–15 min2 tools💬 0

✓ Checked against manufacturer instructions and current safety standards · updated 8.7.2026.

What you'll need

Tools

  • Approved fuel canFor safe mixing and storage.
  • Measuring bottle or dosing cupFor safe mixing and storage.

Materials

  • Fresh unleaded petrolas needed
  • Quality 2T oil for air-cooled enginesaccording to the ratio
Estimated cost5–20 KM
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1 Check the specified ratio

Find the exact ratio on the cap, in the manual or in the technical data. A common 1:50 ratio means 20 ml of oil per 1 l of petrol, while 1:40 means 25 ml per 1 l.

Check the specified ratio

2 Calculate the amount you need

Prepare only as much as you will use within a few weeks. For 5 l of petrol at a 1:50 ratio, you need 100 ml of 2T oil.

3 Pour it into an approved can

First pour half the petrol into the can, add the precisely measured oil, close it and shake it. Then add the rest of the petrol and stir again gently.

⚠ Warning: Too little oil can seize the engine, while too much creates smoke and deposits. Do not estimate by eye and do not use car engine oil.

4 Label the mixture

Write the ratio and the preparation date on the can. Do not use an unlabelled drink bottle, because it is easy to confuse the contents and that packaging is not fuel-resistant.

? Tip: Keep the mixture sealed, in the shade and out of the reach of children; hand over old fuel at a hazardous waste collection point.

5 Fill only a cold saw

Before each fill, shake the can, switch off and let the saw cool, wipe the area around the cap and fill away from the place where you will start the engine.