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 - Running Beans in East Central Indiana - by The Red, John Fritz. Fall is my second favorite season behind the long days of summer. The calendar reads late September and it�s time to start running beans. This article is about my experiences helping my farm neighbor Ernie Swoveland, along with his grandsons Jeff and Craig Ring, with the soybean harvest in East Central Indiana for the 1999 season.
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