Oil filters

k&n,delco, or mobil 1
i used to run royal purple oil on my L36 when that popped i noticed the pistons were all black, despite me never running EGR. i run mobil 1 now on my L32

i use the mobil 1 filter, its pretty sweet, and you can feel the idle improve, it wasnt rough running like it was with the....oh no!!! fram that was on there before. i think any filter with hi quality filtration and a functioning anti drainback valve works good. but the hi temp silicone in k&n and mobil 1 filters (think they are both made by champion filters...??)

i was running Amsoil filters but I just switched to KN