Agreed. The zinc additive in some racing oils is for high performance high revving engines with flat tappets and high resistance valve springs. Many of these older tractor engines (1950s and older) were designed to run on nondetergent oil - that means zero additives. The current engine oils are so much better the lack of zinc is of no importance.
If you have to have zinc in your oil the two brands with the highest concentrates today are Comp Cams Engine Break in Oil, and Champion Power Sheild Break in Oil. They also have an equally high amount of phosphorous.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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