2-Stroke Oil Mixing Calculator
Calculate the exact amount of 2-stroke oil needed for your fuel mix. Ensure optimal engine performance and longevity.
2 Stroke Oil Mixing Calculator
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Perfect Mix
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How the Calculator Works
Enter Fuel Amount
Enter your total fuel volume in gallons or liters using the unit toggle. You can use decimals for partial amounts (e.g., 2.5 gallons).
Select Your Ratio
Choose your desired gas-to-oil mix ratio. Common ratios are 25:1 (older engines), 40:1 (standard), or 50:1 (modern engines). You can also enter a custom ratio.
Get Your Result
The calculator divides the fuel amount by the ratio to show exactly how much 2-stroke oil you need for a perfect mix.
How much 2 stroke oil for 5 gallons of gas?
Oil Required for 5 Gallons
16.0 oz
(473 ml)
Expert Guides
Is it bad to mix 2 stroke oils?
Mixing different brands of 2-stroke oils is generally not recommended but usually not harmful for occasional use. Different oils may have different additive packages that could reduce effectiveness.
Pro Tip
If you must mix, use oils of the same type (synthetic with synthetic, mineral with mineral).
Can you mix 2 stroke oils?
Yes, you can mix 2-stroke oils in emergencies. Most modern 2-stroke oils are compatible with each other. However, mixing oils from different manufacturers may dilute the effectiveness of premium additives.
Pro Tip
After mixing, use the mixture quickly and switch back to a single oil brand at your next fill.
Can you mix 2 stroke oil in the tank?
Yes, you can mix 2-stroke oil directly in the fuel tank. Pour the oil in first, then add gasoline - the turbulence from filling helps mix them together.
Pro Tip
Always add oil first, then fuel. This ensures better mixing from fuel turbulence.
Common 2-Stroke Mix Ratios
| Fuel | Ratio | Oil Required |
|---|
Quick Reference (1 Gallon)
25:1 Ratio
Oil needed:
5.1 oz
40:1 Ratio
Oil needed:
3.2 oz
50:1 Ratio
Oil needed:
2.6 oz
Frequently Asked Questions
How long does 2 stroke fuel last?
Ideally use 2-stroke fuel within 30 days. In a sealed container it may be okay for up to about 2–3 months (longer with stabilizer), but if it smells bad or looks off, mix a fresh batch.
50 to 1 ratio in litres?
At 50:1 you add 20 ml of 2-stroke oil per 1 liter of fuel. Examples: 2 L = 40 ml, 5 L = 100 ml.
How many ounces of 2 stroke oil for 5 gallons?
For 5 gallons: at 50:1 use 12.8 fl oz, at 40:1 use 16 fl oz, at 32:1 use 20 fl oz of oil.
How much 2 stroke oil per gallon?
For 1 US gallon: 50:1 = 2.6 fl oz, 40:1 = 3.2 fl oz, 32:1 = 4.0 fl oz, 25:1 = 5.1 fl oz.
Always consult your equipment's owner manual for the manufacturer's recommended oil mix ratio. This calculator provides estimates for informational purposes.