what oil to use

if its meets SM how can still have high levels of zinc? when lab test have shown that the new rotela rated SM has lesss than 800 PPM of ZZdP

Ace said
So which part of the specs don't you understand? That the allowed HDEO ZDDP levels between the API service ratings is insignificant, or that the API/ISLAC rating scales test different factors?
Click to expand...