[tubman]

You are correct Mike. To the best of my knowledge, all oil that is at least 50 weight has high amounts of zinc. I started using it when I had a case left over from my dirt track days. The hemi in my racecar had an enlarged oil pan, dual filters and a large oil cooler when meant it took 13 quarts of oil for a change. When I built the car, all the old timers told me "hemi's need lots of oil". Changing the oil in that car was more of a financial decision than anything else.