The best oil for the Jeep 4.0


This is a reply email I got from Shell when I asked about ZDDP content of the new formula Rotella
Thank you for your interest in Shell products.

Our Rotella T4 15W40 (CK4) contains about 1200 ppm of zinc and 1100 of phosphous. These are the components of the ZDDP for antiwear protection.
Rotella T4 15W40 (CK4) is generally recommended for older flat tappet cam motors.

Do not buy STP oil treatment for the purpose of Zinc or ZDDP additive. I made this mistake after reading the 15oz bottle stating it's first ingredient is Zinc.
I later found out from STP there is only 5ppm of ZDDP


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