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 - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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