Quote:
Originally Posted by Bored&Stroked
Me, I run straight break-in oil until I know the rings are seated . . . then I switch over to whatever oil I'll run for the long term. Back in the day, we ran non-detergent 30 weight for the first 500 miles or so, then switched over to a multi-viscosity oil . . .  |
AHA! Note that "back in the day" engines were broken in with non-detergent oil. Did you know that non-detergent oil didn't have any zinc in it? And the camshafts did not go flat? How can that be?? Nowadays the 'experts' say you must have high zinc oil or your flathead will die!