Originally Posted By: tig1
but no oil used here gives longer engine life or cleaner engines than M1.
I don't believe that you can say this, Tig. I submit that any oil changed in a timely manner will make an engine last as long and stay as clean as M1. You don't have the original 32 year old car that you threw M1 into "back in the day" ..and you'll not have this car into the 500k range. You'll never reach its end of life without defect or neglect. Neither will anyone else with any other oil. I don't care if it's Amsoil or SuperTech. If it's approved for the engine and changed at appropriate intervals, there's really no advantage of one oil over another.
Just ask Doug Hillary. He'll tell you that there is no such thing as magic oil. He ran side by side with competitors running conventional oil while he used the galactic flagship of HDEO's Delvac 1. He maintained his and his competitor's fleets and saw no SIGNIFICANT difference in engine life. What he managed was much less down time due to oil changes. He managed about 4X the mileage out of the sump.