The Ultimate Guide to STIHL Fuel Mix: Everything You Need to Know

When it comes to maintaining your STIHL tools, using the correct fuel mix is essential for optimal performance and longevity. The ideal fuel mix ratio for all STIHL 2-stroke machines is 50:1 ratio mix, meaning 50 parts petrol to 1 part oil. This ratio applies to all STIHL 2-stroke equipment, including chainsaws, blowers, hedge trimmers, and brushcutters.

Here’s the simple breakdown:

• 1 litre of petrol add 20 millilitres of oil

• 2 litres of petrol add 40 millilitres of oil

• 3 litres of petrol add 60 millilitres of oil

• 4 litres of petrol add 80 millilitres of oil

• 5 litres of petrol add 100 millilitres of oil

So, for every 1 liter of petrol, you add 20 milliliters of oil to get the correct 50:1 fuel mix for your STIHL 2-stroke equipment.

If you want an easy alternative, STIHL’s MotoMix is a pre-mixed option that’s ready to use and ensures perfect performance. Keep reading for more details on how to mix fuel correctly and tips for keeping your tools in top condition.

What is the correct fuel mix for STIHL machines?

The correct fuel mix ratio for STIHL 2-stroke engines is 50:1—this means 50 parts petrol to 1 part oil. Here’s what you need:

• Unleaded petrol with an octane rating of 95.

• STIHL 2-stroke engine oil.

This 50:1 ratio is used across all STIHL 2-stroke machines, such as:

• Chainsaws

• Blowers

• Hedge trimmers

• Brushcutters

• Kombi systems

• Cut-off machines

Mixing your fuel properly ensures that your equipment runs smoothly and avoids damage to the engine.

Why is the 50:1 fuel mix ratio important?

Using the correct fuel mix ratio is critical for maintaining the performance of your STIHL tools. If the mix contains too little oil, the engine will not receive adequate lubrication, which can cause excessive wear and even lead to engine failure. On the other hand, too much oil in the mix can cause a smoky exhaust, carbon build-up, and reduced performance.

The 50:1 ratio strikes the perfect balance between providing enough lubrication and keeping the engine running efficiently. That’s why it’s important to get the ratio right every time you mix fuel for your tools.

How to mix fuel for your STIHL tools

Mixing the fuel correctly is easy if you follow these steps:

1. Use the right petrol: STIHL recommends unleaded petrol with an octane rating of 95. Avoid using petrol with ethanol as this can damage your engine.

2. Use STIHL 2-stroke engine oil: STIHL’s engine oil is specifically designed to work with their machines, ensuring proper lubrication and performance. It contains additives to help maintain engine health and reduce deposits.

3. Mix the fuel in an approved container: Use a clean, approved fuel container to mix your petrol and oil. Never mix fuel directly in your machine’s fuel tank.

4. Measure accurately: For a 50:1 ratio, you’ll need 2.6 ounces of STIHL 2-stroke oil for every gallon of petrol. Always measure carefully to ensure the correct mix.

5. Shake well: Once you’ve added the oil to the petrol, securely close the container and shake it to ensure the oil is fully mixed with the fuel.

6. Label the container: Clearly label the container with the date of mixing and the fuel ratio to avoid confusion. Fuel can degrade over time, so it’s best to use mixed fuel within 30 days for optimal performance.

MotoMix: a pre-mixed fuel solution

If you want to skip the hassle of mixing fuel yourself, STIHL offers MotoMix, a high-quality, pre-mixed fuel option that is ready to use right out of the can. MotoMix contains 92 octane petrol with no ethanol, pre-mixed with STIHL’s premium 2-stroke engine oil.

The benefits of MotoMix include:

• Convenience: No need to worry about getting the fuel mix ratio right—just pour it in and go.

• Extended shelf life: MotoMix stays fresh for up to two years after opening, compared to 30 days for mixed fuel.

• Optimal performance: MotoMix ensures the perfect fuel mix, providing maximum power, efficient combustion, and minimal deposits inside the engine.

While MotoMix is slightly more expensive than mixing your fuel, the convenience and extended shelf life make it a great option for those who use their tools less frequently or want the peace of mind of a perfectly mixed fuel every time.

Tips for proper machine care and fuel management

Fuel management is critical to extending the life of your STIHL tools. Here are some tips to keep your machines running smoothly:

1. Use Fresh Fuel

Fuel can degrade over time, especially if it contains ethanol, which absorbs moisture and can lead to phase separation. Always use fresh fuel, ideally within 30 days of mixing, to prevent damage to your engine.

2. Store Fuel Properly

Store fuel in a cool, dry place and in an approved container. Keep the container tightly sealed to avoid evaporation and moisture absorption.

3. Drain Fuel When Not in Use

If you won’t be using your tools for an extended period, drain the fuel from the tank and run the engine until it stops to remove any fuel left in the carburetor. This prevents fuel from becoming stale and clogging the system.

4. Use STIHL Engine Oil

Using the right oil is just as important as using the correct fuel. STIHL 2-stroke oil contains additives that help reduce engine wear, keep deposits to a minimum, and improve the overall lifespan of your tools.

5. Inspect Your Fuel System Regularly

Check fuel lines, filters, and the tank cap regularly to ensure they’re in good condition. Over time, fuel lines can become brittle, and fuel filters can become clogged, leading to performance issues.

Conclusion: keep your STIHL tools running smoothly

Using the correct fuel mix is one of the most important things you can do to ensure the longevity and performance of your STIHL tools. Whether you’re using a chainsaw, blower, hedge trimmer, or brushcutter, the 50:1 fuel mix ratio is essential for optimal performance. If you prefer a hassle-free option, STIHL MotoMix offers the perfect pre-mixed solution that’s ready to go and keeps your engine running smoothly.

By following proper fuel management practices and using high-quality STIHL products, you can extend the life of your tools, reduce wear, and keep them performing at their best. So, whether you’re a homeowner or a professional, understanding and maintaining the correct fuel mix is key to getting the most out of your STIHL equipment.