I followed the threads regarding the lowering of the zinc content in the Rotella -t 10w-40 in 2007.  I went to wallmart and purchased 8 gallons and realized with reading glasses and magnifying glass that it had the CJ-4 rating which I now understand to be the "least" amount or possibly the 2007 standard. (multi colors on label)   I then went to another wallmart and found a couple of gallons of 10w-40 w/ the CI-4 rating  (mostly blue label)that I understand to be a more preferable zinc level.

I live in CA and I found Rotella 30Wt w/ only a CF-4 rating.  (mostly blue label) Would this be a higher zinc content?

The car will stay in CA is there any reason to not use a straight 30wt if the CF-4 is a higher content of zinc?

Thank you, paul f 

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