I've been away from it for awhile but I thought the ZDDP levels set by
API varied by oil weight so that a weight not currently used by the OEM
auto manufacturers could have a higher allowable ZDDP level.
Deikis, John G wrote:
> Maximum ZDDP levels are specified by the industry standards (currently
> "SM") promulgated by the API, an industry group. ...
...
If the Kendall bottle displays the API donut
> and says anything "above" service SJ, the guy is just blowing smoke.
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