Optifuel OH1218K - Optimix Fuel 12% Nitro 5 LOptimix 12 Designed for training, intermediate flyers, sport aircraft and boats. 12% Nitromethane and 18% Synthetic Oil. Supplied in full 5L containers not US Gallon (3. 78L)! Optimix 12 is designed for sport, training and scale modellers. Works well on helicopter engines and aircraft alike, low smoke high power. Content: 5L Optimix fuel with 12% Nitromethane & 18% Klotz Synthetic oil Optifuel is the product of extensive testing and development using