I've been wondering this for awhile, some might too. I would like an answer from some1 who KNOWS there shit. Not a frigin poser who is a know-it-nothing.

my car requires 5w-30. I changed the pistons to forged and is a lower compression 8.8:1. Could I run a 5w-10/20 or even a 0w-5/10?

my car is driven about 100 miles in a single day on hwy in shitty ass traffic and used on the strip. So i wanting a good smooth motion for my motor. any help?? Appreciate it!