My $.02 is that I can tell you there are a diehard set of Amsoil devotees out there that swear by Amsoil products. I believe they make additives, but I know for sure they make a synth oil that is a competitor to Mobil 1. Now I've never used anything but Mobil 1, and my engine has never blown up :wi...

Volvoites - please help. Just bought V70 with 100k up but in really great condition, timing belt changed on time etc and no obvious faults. Will provide servicing myself but what's the story on oil additives? Do they work or not? My research shows some experts saying that 3000 miles service interval...