I was chatting with my Dad (ShootingStar here on this forum) this morning and am still undecided on the use of M1-105s for track days with my Integra Type R. I was leaning towards Patman's findings on Wix and their claimed flow ratings, but my Dad comes back with his theory on the M1s and possible limited flow and bypass.... "If bypass is limited, a cleaner oil in bypass may be the same as a dirtyier oil in full flow." Meaning that the M1 would filter better than say Wix, SuperTech, whatever.