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mobil 1. Almost 10yrs and no problems. Hotrod, what vfast and jeep said. It's not just thinner, it's the detergents clean everything, including seals and gaskets. If you have a bunch of hardened goop around your worn seals or hardened gaskets, synthetic will clean all that up, resulting in smoke and leaks.
I put Ams in our expedition but in my stang right now im runnin durablend uhhh*forgets brand name* well its durablend sometin comes in a blue bottle valvoline i think</P>