I apologize in advance. I was away from BITOG for about nine months and I'm now in the dark on what's probably common knowledge - Question - what's the word on the BITOG street concerning (eg) M1 0w20 vs M1 5w20 EP ? Nine months ago it seemed EP was getting negative press even from some BITOG sages. But lately I've been catching up on all these series IV test results by Castrol Edge and Syn Power, and I noticed that Castrol Edge degrades regular M1, and then mentions EP but does not claim superiority to EP. I also read a recent long OCI UOA on EP, and the numbers were great. Added to that, I used M1 10w30 EP in my mom's '98 Taurus for one year (close to 10k) and had excellent wear numbers that impressed Blackstone (and me). I'm in search of the 1 year OCI (12-14k) oil for my Mazda (presently M1 0w20) and I'm wondering what's up with EP. Thanks for any input!