totallimmortal from my expierience rx-7s don't much care what oil you use, and older engine or a good one in a hot climate will like thicker oil. But there was a guy on here who modded his OMP to run 2 stroke oil from a tank and ran 0w synthetic in the crank and said it ran better. also i'm not sure if i'll get killed by people for saying it but i like the kn filter for out cars even better than stock i always had a little more pressure with them, whatever you do don.t get a fram filter lol

Years ago Fram was a quality filter manufacturer. Now their standard filter (the radioactive-orange cans) is one of the worst out there. It features cardboard end caps for the filter element that are glued in place. The rubber anti-drainback valve seals against the cardboard and frequently leaks, causing dirty oil to drain back into the pan. The bypass valves are plastic and are sometimes not molded correctly, which allows them to leak all the time. The stamped-metal threaded end is weakly constructed and it has smaller and fewer oil inlet holes, which may restrict flow. I had one of these filters fail in my previous car. The filter element collapsed and bits of filter and glue were circulating through my system. The oil passage to the head became blocked and the head got so hot from oil starvation that it actually melted the vacuum lines connected to it as well as the wires near it.