SPARKY - Zinc additive, ZDDP is a total WASTE of money in a Super C. Yes, ALL IH over-head valve tractor engines had flat tappet cams & lifters.
If you'd use Rotella 15W-40 or straight 30W oil in the engine that oil has PLENTY of ZDDP in it to protect your cam & lifters. The spring pressure and valve lift on those old tractor engines is low enough you don't even need any ZDDP, but the 15W-40 has 1200 PPM and the 30W even more, 1400 PPM.
Other diesel rated oils like Mobil Delvac, Chevron Delo, etc. may have ZDDP in them too, you'd have to call them, like I called Shell about Rotella.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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