I use amsoil saber at 50:1 but i break em in with castor at 24:1, i have used regular old 2 smoke oil befor and i got a lot of engine noise, i switched to the amsoil and no more engine ratlin and sounds well lubed even at high rpms, i am going to run this stuff for the life of the engine and see if the milage compares, my last dax 67cc ran over 7k before i swapped it out, in fact that motor still ran but has little compression.