Mixing of fuel at 40:1 is essential for those who are using 2 stroke engine. If your engine has a proper fuel ratio, it will help to keep your engine lubricated, run smoothly, and avoid damage. If you’re using a 2-stroke engine, using the 40 to 1 fuel mix is one of the most common and reliable options. A proper 40 1 ratio calculator or chart can save you from guesswork and help keep your engine running smoothly.
What is the 40:1 Fuel Mix?
40:1 means that 40 parts of gasoline and 1 part of 2 stoke oil. This ratio provides the right amount of lubrication while keeping the performance balanced.
For Example:
- 1 gallon of gas (128 oz) mixed with 3.2 oz of 2-stroke oil equals a 40:1 fuel-to-oil ratio.
- 5 litres of petrol mixed with 125 ml of oil gives you the same 40:1 mix.
Instead of doing the math yourself, just use this 40 to 1 fuel mix chart, which helps you find the perfect 2-stroke oil mix ratio for any fuel amount in seconds.
40 to 1 Fuel Mix Chart
| Fuel Amount (Litres) | Oil Required (ml) | Fuel Amount (Gallons) | Oil Required (Ounces) |
| 1 L | 25 ml | 1 gal | 3.2 oz |
| 2 L | 50 ml | 2 gal | 6.4 oz |
| 3 L | 75 ml | 3 gal | 9.6 oz |
| 4 L | 100 ml | 4 gal | 12.8 oz |
| 5 L | 125 ml | 5 gal | 16 oz |
| 8 L | 200 ml | 8 gal | 25.6 oz |
| 10 L | 250 ml | 10 gal | 32 oz |
| 20 L | 500 ml | 20 gal | 64 oz |
| 25 L | 625 ml | 25 gal | 80 oz |
| 40 L | 1000 ml (1 L) | 40 gal | 128 oz (1 quart) |
How to Mix 40 to One (Gasoline and Oil) Fuel Mixture Safely
- Use a Clean and safe fuel container
- Pour oil first into your approved fuel container.
- Add fresh unleaded gasoline.
- Shake or stir well to make a proper blend.
- Label the container clearly with the ratio used.
Pro tip: If you don’t want to do math every time, use a two-stroke oil mix calculator; it instantly gives you the exact oil measurement.
Why This Ratio Matters
- Prevents engine wear and tear
- Reduces carbon buildup
- Delivers consistent power output
- Saves time with accurate mixing
Whether you’re fueling a chainsaw, dirt bike, trimmer, or any 2-stroke machine, the 40 to 1 fuel mix chart ensures your engine gets the perfect balance of fuel and lubrication.
FAQ’S
1. Is 40:1 the same as 50:1?
No, they’re different. A 40:1 mix has a little more oil than 50:1, which gives better lubrication but can create slightly more smoke.
2. Can I use synthetic 2-stroke oil for a 40:1 fuel mix?
Yes, you can. Just ensure you use high-quality synthetic oil specifically designed for 2-stroke engines.
3. What kind of engines typically use a 40:1 mix?
Many older chainsaws, dirt bikes, outboard motors, and tools that run under heavier loads usually perform well on a 40:1 fuel mix.
4. What happens if I use less oil than the 40:1 ratio?
Running lean (with less oil) can lead to poor lubrication, overheating, or even serious engine damage over time.