Zinc, phosphorous, magnesium and calcium are all part of typical additive packages. Zinc is one of the main anti-wear components of the add. pack. The amount of zinc varies based upon application and the oil/add. pack manufacturer. Our CAT hydraulic 10W test oil runs at about 700 ppm zinc. This is about the bottom end of whats commercially available worldwide - in our eyes the more zinc the better. Engine and gear oils run all over the place in terms of zinc, so I wouldn't say 3500 ppm of zinc is overkill.

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