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Seaford, Delaware | Dave,
Caterpillar requires a minimum of 900 parts per million (PPM) of zinc to reduce friction, prevent scuffing, and decrease wear. Zinc dialkyldithiophosphate possesses excellent thermal-oxidative and hydrolytic stability, while at the same time providing superior gear wear performance. The big push right now in the industry is to formulate with an anti-varnish additive to prevent oxidation which can lead to varnish build-up which can render servo-valves useless because they will start sticking.
Alan
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Follow-up on hydraulic vs. motor oil
