50:1 Gas Oil Mix Calculator

A 50:1 gas-oil mix means 50 parts of gasoline to 1 part of 2-stroke oil. For example, 1 US gallon of gas requires 2.6 fluid ounces of oil, or 1 liter of gas needs 20 milliliters of oil.

For 5 liters of gasoline at a 50:1 ratio, you need 100 milliliters (mL) of 2-stroke oil.

For 1 US gallon of gasoline at a 50:1 ratio, you need 2.6 fluid ounces (fl oz) of 2-stroke oil.

Not always. While 50:1 is common for modern engines with synthetic oil, older engines may require richer ratios like 40:1 or 32:1. Always check your owner's manual for the manufacturer's recommendation.

Adding too much oil will cause excessive smoke, carbon buildup, and fouled spark plugs. Adding too little oil can lead to engine damage from insufficient lubrication.

No, engines with oil injection systems mix the oil automatically. You only need to keep the oil reservoir filled. Premixing is for engines without automatic injection.

Premixed 2-stroke fuel should ideally be used within 30 days. Use fresh gasoline and consider adding a fuel stabilizer if you need to store it longer.

Yes, always shake the fuel container thoroughly after adding oil to ensure the oil and gasoline mix evenly throughout the fuel.

Use the units that match your measuring tools. This calculator supports both metric (liters/milliliters) and US imperial (gallons/fluid ounces) units.