I've been using mostly Castrol Edge (black bottle, non-EP) along with strictly AC Delco filters *UFI cap *. I've ran it strictly following the OLM. However, I remember someone a while ago on BITOG running some UOAs and saying that some oils looked on the edge of shearing at around 20%. Do you guys have any suggestions on oil brands and if I should still follow the OLM? Thanks. I don't mind spending a little more.