hey guys like i said, i have ran amsoil for 7 years, i had a fresh topend that i ran amsoil in for 6 years and i ran it very hard. i havent hard of many topends lasting that long, i have tried other oils and hate them, also why would u want an oil that doesn't stay suspended in the gas anyway?? not trying to say amsoil is the best, but i have tried and seen friends use other oils and they can't hold a flame to the amsoil.. when i tore the motor down(after 6 years of abuse) it still had good compression, i sold it for a fair price only because i bought a cub, i have a buddy that ran his shee witout coolant( dumbass left the radiator hose loose) and it locked up, after it cooled down it started back and ran as fine as ever, now thats good oil, any other oil and i would say it would have trashed the topend, his compression is the same it always was..