Engine oils.

So I recently switched from Schaeffer's 7000 20W-50 to Valvoline SynPower 5W-40 MST from a suggestion by @Wyrmrider in my 360. It has a roller cam so zddp wasn't an issue. The cold-start oil pressure buildup isn't much quicker than before but the engine seems to have a little less internal friction; idle got smoother and went up just a hair. I'll probably keep using this oil because it's available at Wally World and $.50-1.00 cheaper per quart than the Schaeffer's. Apparently that MST stuff is approved for use in modern Euro diesel engines so I'm willing to bet it would keep flat-tappet cams alive, some of those Euro diesels do actually use "flat" cam followers.

I noticed it smells nice too, very very mild scent almost has no smell at all compared to typical motor oil. You know that pungent additive/detergent stank lol