Originally Posted By: wileyE
most notable point in the document:
"Quantity of zinc content alone does not indicate
its performance. Therefore, it cannot be assumed that oils with higher concentrations of zinc provide better wear protection.
Additional testing must be reviewed to determine an oil’s actual ability to prevent wear.The wear testing further in this document
reflects the general lack of correlation between zinc levels and wear protection. Due to this lack of correlation, zinc levels
are not included in the scoring and summary of results contained in the review"
There is something to that..... many of us have been watching the UOA's on the new CJ Rotella and they look as good or better than the previous CI even though they have lower levels of zinc/phosporus.
And... if I read the following correctly, the JASO MA requirement for phosphorus is now 800 - 1200..... (sheet 5, table 4).
JASO Docment