Well........ took advice and tried amsoil interceptor........ that shit sucks/..... carboned up to the point I had to tap valves out,;;... I run 2000 miles a year on that sled for the past 3 years..... The rest of my 1500-2000 are split between my others.... I will go back to yame oil,,, as I have not had build up so bad that it sticks,,,, gummed up a bit maybe but not to the point it sticks and freezes up..... Found out my dad never had his valves cleaned on his 02 viper after 7500 miles so I did the deed.. no where near the mess as the amsoil... slid right out.... save your money.... This is the second time I've tried this. First was on my doo ,,,,,, at 1500 miles It was twice as worst than 3000 on the doo oil.......