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Excuse me but 2.5 bar is more like 36.75 psi (14.7 times 2.5 )
So im running 51.45 psi at highway speeds ( 14.7 times 3.5 )
Correct me if im wrong but a Bar is 14.7 psi ( atmospheric pressure at sea level )
1 bar = 14.503 psi.
14.7 is ~ one atm, and its also the stoichiometric afr for gasoline, but really, we're just splitting hairs between 14.5 and 14.7.
Amsoil is good oil, I use Mobil 1 20w 50 for performance cars, I use Redline 10w 40in my 964. Both have high levels of ZDDP. Plenty of good choices out there.