Hi, Been using Castrol GTX 5w-20 in our 08 Honda Cr-v and it seems to be working pretty well. But the onboard MM has me doing oil changes at around 9k-10k. So I'd like to use a synthetic 5w-20 that's widely available, and not too expensive. I just did on oil change last night to PP 5w-20 and the lifters seem to be ticking at idle. The sound is barely there but I notice it....my wife doesnt . The filter is a M1. So whats the thickest synthetic 5w-20?