Check out http://www.geocities.com/MotorCity/2195/engineoil_bible.html George_Earle@chordiant.com wrote: > Snake oil or not, I have used Slick 50, and Mobil 1, Duralube and Mobil 1, > and now Prolong and Castrol Syntex (Castrol advertises the same qualities > as Prolong et al--Mobil 1 is the patent owner of all synthetics) in all my >