Lucas Response To Zinc Additive

Remow2112 said

And it will bring up the break down of their SM rated VR1. Which according to the doc is .14/.13 on the zinc/phos.

Dan...

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There was a discussion about zinc a while back where someone posted a comparison between a ppm number and a .xx number so it would be easier to compare the oil in question. I just don't recall what it was or how to figure it out.