Oil gas ratio
Gas and Oil Mixing Charts The following gas and oil fuel mix ratio charts are a handy reference for those using any type of engine that requires mixed fuel. For 5 gallons of gas, with a 50:1 ratio, the amount of oil required is 12.8 US ounces (100 ml). Experts agree that it is better to err toward the side of too much oil, rather than not enough. Typical break in period ratios are about twice the normal; 50:1 is generally 25:1 during break in. All STIHL gasoline-powered equipment uses a 50:1 gas and oil mixture. The chart below can help you figure out the correct measurements to use. For high-performance fuel that requires no mixing, choose STIHL MotoMix® premixed fuel.