since my brother is an amsoil dealer i know this stuff, all amsoil simply does is has you send in a sample of your oil to blackstone and they determine if the oils bad and caused the problem. we run amsoil in the 11 cars we own and they get an oil change once a year, my father also owns a machinery moving bussiness with 10 semis and about 25 forklifts, they all have amsoil and recieve oil changes once a year, none of these engines have ever had a problem, have you ever tried amsoil? have you ever did any research on they're products? the guy who started mobile one used to work for amsoil, amsoils used in all the military planes because its the only oil that doesnt deteriorate, try it for a year and then if you decide you dont like tell me its *****, but until you try it you have no clue weather or not its the same as every other synthetic out there