I've put Amsoil in my MX-6 and my Tempo. Can't tell you it's any better because I had them in there only for about 8,000 on the MX-6, and 15,000 or so on the Tempo. MX-6 is being fixed for head gasket (overheated from busted hose a few too many times) and the Tempo is back on dino because I'm out of my supply of Amsoil. And because I figured that oil better get changed sooner because the filter has the same 15,000 miles on it, and counting.