[JazzleSAURUS]

Originally Posted by mav1178

I've found that owners tend to be in two groups:

A large group that completely ignores the Owner's Manual.

And a smaller group that basically nitpicks every type of technical spec or documentation out there.

I think this is an important point. Clearly it's the same FA20 whether it's in Japan or the US....Or @Tcoat land...

All these cars run fine. If putting 5w-40 in promptly blew your motor, there would be threads about it. Same with the 0w-20 guys. EITHER. WORKS. Just do it right.

I'm in the camp that it makes a lot of sense to have some form of improvement from stock, but you don't need to go nuts.

I think that if you're concerned about oil pressure at all, get a decent oil pressure gauge. Then you can stop being worried because you know what's happening. A little low when you're beating on it? Add the FXT oil cooler. Beating on it all the time? Add a nice setrab cooler. Tracking all the time? Bump up your viscosity.

I think for a DD that might get driven hard on the commute now and again, and might see a track occasionally, an oil pressure gauge with FXT oil cooler and stock or comparable 0w-20 is just fine.
If it's a dedicated toy car, spring for a nice air to oil.