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40 Deluxe · 07-13-2018, 04:59 PM

All oil still has some (plenty enough for a flathead) zinc in it. Do you think oil in the '30's and '40's had zinc in it?? Nope! I've seen flatheads totally worn out, more smoke coming out of the road draft tube than the exhaust, which was pouring out blue smoke, wrist pins rattling, mains thumping, rear main pouring out oil, and the cams were fine. By the way these poor old clunkers were usually fed re-refined oil (no detergent, no zinc, no nothing).

07-13-2018, 04:59 PM	#9
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,835	Re: oil All oil still has some (plenty enough for a flathead) zinc in it. Do you think oil in the '30's and '40's had zinc in it?? Nope! I've seen flatheads totally worn out, more smoke coming out of the road draft tube than the exhaust, which was pouring out blue smoke, wrist pins rattling, mains thumping, rear main pouring out oil, and the cams were fine. By the way these poor old clunkers were usually fed re-refined oil (no detergent, no zinc, no nothing). Last edited by 40 Deluxe; 07-13-2018 at 10:32 PM.