Every person I've asked seems to agree, but then I ran into this website:
http://www.quakerstate.com/pages/carcare/whattoknow.asp
Check out "Myth #7"
Can I really go 5-7K miles between oil changes with synthetic?
http://www.quakerstate.com/pages/carcare/whattoknow.asp
Check out "Myth #7"
Can I really go 5-7K miles between oil changes with synthetic?