I have a 1998 Chevy S-10 2.2L its my daily driver unless theres snow on the road. I got the truck with 80K miles and have been running syn. since it now has 98K miles Im gonna be doing a auto-rx run and rinse I picked up some PYB 5w30 for the clean and rinse phase. My question is should I keep running the PYB after that or switch it back to syn.