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 - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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