This 2-cycle engine oil was designed, tested and proven specifically for use in high-performance small-block gasoline engines due to their high RPM range and lubrication needs. Ideal for the Dynamite .31 Gasoline Engine (5.1cc). The ultimate lubrication package for superior engine performance. Must be used in 14:1 premix ratio with Dynamite .31 Gasoline Engine (5.1cc) engine