Originally Posted by perkj
I second 5w40 AMSOIL European formula. While it cost more, you can change less frequestly. I used to change Moble 1 every 2500 miles, however now with Amsoil I go 5000 miles. My Amsoil rep swears it can go 20K w/ no break down (and has data to prove it), but I like piece of mind....10K would be realistic IMO though, but 5K makes me feel good
yea... that's the problem, the synthetic oil breaking down isn't the problem. It's the oil picking up all the contaminants that does the oil in. Getting 20K miles out of oil is definantly do-able, it's just you should use amsoils extra filter to keep the contaminants out of the oil & I beleive they change that oil filter every 5 or 10K miles.
I go 3-4K between oil changes... no matter what synthetic oil I put in there I will not go longer then 4K.