Oil zddp ?

RustyRatRod said

Nothing. It's all I use. And not because of stupid myths. I use it because of the cost difference. I can get Lucas Hot Rod oil through work, and it's still cheaper than any of the synthetics, plus it has 2400 PPM of zinc. If I'm gonna dump it out after 3000-7500 miles, I don't see the need for the added expense.

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Same here, and always have even with stockish hydraulic flat tappet valve trains.
Castrol GTX 10/40 or 20/50 in my magnum, Wife's 318 Dart, the BMW325, Daughters Avenger all of our motorcycles, and even the lawn mower.:D
Never had a lubrication failure in anything I have run it in, and you can get it for 17 and change for a 5 quart jug.