Purebred said:Seems like there are some people in here who know something about oil![]()
What about Castrol Syntec? That's what my mechanics use, and they say that it meets or exceeds the standards for all manufacturer warranties - and that it should be changed ~7500 miles or so.
What do you all think?
Also, is there any harm in changing from Castrol to another synthetic?
Syntec is generally regarded as the lesser of the synthetics based upon how it does on stress tests and wear tests. It is still better than non-synthetic, but it's not as good as the others listed. (And I am a huge John Force fan and would support Castrol if I could).
There's no harm in changing to another brand.

