How Much 2-Stroke Oil for 10 Liters of Gas?
At 50:1, add 200 mL (6.8 fl oz) of 2-stroke oil.
At 40:1, add 250 mL (8.5 fl oz).
At 32:1, add 313 mL (10.6 fl oz).
Not sure which ratio? Use the one in your owner's manual or on the fuel cap. Most modern handheld equipment is 50:1. Other amounts: open the calculator.
Ten litres suits regular use, two-tool households, or a small outboard. As with any large batch, only mix what you will use within about a month unless you add fuel stabilizer.
Oil for 10 Liters at Every Ratio
| Ratio | Oil (fl oz) | Oil (mL) | Easy measure | Typically used for |
|---|---|---|---|---|
| 50:1 | 6.8 fl oz | 200 mL | about 13.5 tablespoons | Modern chainsaws, trimmers, blowers; most modern outboards |
| 40:1 | 8.5 fl oz | 250 mL | about 1.1 cups | Older equipment, some trimmers and outboards, many dirt bikes |
| 32:1 | 10.6 fl oz | 313 mL | about 1.3 cups | Dirt bikes and motocross, high-load engines |
| 30:1 | 11.3 fl oz | 333 mL | about 1.4 cups | Vintage outboards |
| 25:1 | 13.5 fl oz | 400 mL | about 1.7 cups | Older equipment, break-in when specified |
| 20:1 | 16.9 fl oz | 500 mL | about 2.1 cups | Vintage engines, some racing |
| 16:1 | 21.1 fl oz | 625 mL | about 2.6 cups | Antique engines and outboards |
10 liters is 2.64 US gallons. The mL amounts above are exact for any metric ratio: divide the fuel in mL by the ratio (10000 ÷ 50 = 200 mL).
How Precise Do You Need to Be?
Staying within about 10% of the target amount keeps you close to the intended ratio. For 10 liters at 50:1 that means 180–220 mL of oil, and at 40:1, 225–275 mL.
At this batch size, an extra 10 mL of oil turns a 50:1 mix into about 47.6:1, and 10 mL too little makes it about 52.6:1. Running slightly rich (more oil) is safer for the engine than running lean.
Mixed 10 Liters at the Wrong Ratio?
You don't need to throw it out. To correct a full 10-liter batch:
| Situation | Fix |
|---|---|
| Mixed 40:1, need 50:1 | Add 2.5 liters of fresh gas (12.5 liters total) |
| Mixed 50:1, need 40:1 | Add 50 mL more oil |
| Mixed 50:1, need 32:1 | Add 113 mL more oil |
| Mixed 32:1, need 50:1 | Add 5.63 liters of fresh gas (15.63 liters total) |
Adding gas makes the batch bigger, so only lean out a mix if you will use the extra fuel within about a month.
How to Mix 10 Liters
- Measure the oil, for example 200 mL (6.8 fl oz) for 50:1. A ratio measuring cup reads directly in ounces and mL.
- Use a 10-litre jerrycan, or mix two 5-litre batches.
- Cap it tightly and shake for about 30 seconds. A fuel can with a sealing cap prevents spills while you shake.
- Write the ratio and date on the can. Shake again before each refill if the can has been sitting.
10 Liters: Common Questions
How much oil for 10 liters of gas at 50:1?
10 liters at 50:1 needs 200 mL (6.8 fl oz) of 2-stroke oil.
How much oil for 10 liters of gas at 40:1?
10 liters at 40:1 needs 250 mL (8.5 fl oz) of 2-stroke oil.
How much oil for 10 liters of gas at 32:1?
10 liters at 32:1 needs 313 mL (10.6 fl oz) of 2-stroke oil.
I mixed 10 liters at 40:1 but my engine needs 50:1. What do I do?
Add 2.5 liters of fresh gas (12.5 liters total). That brings the batch back to 50:1 without wasting it.
How long does 10 liters of mixed fuel last?
Mixed 2-stroke fuel without stabilizer is best used within about 30 days. A fuel stabilizer extends that; follow the storage time on the stabilizer's label.
Other Fuel Amounts
Need a ratio guide instead? See 50:1, 40:1, 32:1 or all ratios.