[THEFERMANATOR]

Originally Posted by spareparts

rotella!

Since 2011 when diesels started using DEF they reduced the ZINC and phosfourous levels in Rotells as well. It is alot higher than gas oil is, but still nothing like ROTELLA was in 06. Pre emissions Rotella was around 1300 PPM of ZINC, now it's around 800 The minumum for a flat tappet cam during break in is 1100 or so, and around 900 for regular oil changes(unless you have a modern hardened flat tappet cam, and then they say a properly broke in cam will live an OK life at 750). To put it in perspective, I believe modern S rated oils are around 300-450 PPM of ZINC. VALVOLINE XR racing oils are still around 1250-1300 as well as a few other performance oils.

DISCLAIMER: My numbers may be off as it has been awhile since I researched oil formulation changes. And this is for US based products, international markets can still have higher levels of ZINC and PHOSFOUROUS since they don't have our messed up emission regs and systems.