1st Gen. Ram - All Topics Discussion for all Dodge Rams prior to 1994. This includes engine, drivetrain and non-drivetrain discussions. Anything prior to 1994 should go in here.

Anyone running a ZDDP additive in their oil?

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Old 12-06-2011, 10:05 AM
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Where are you finding the CI4+ oil? I looked for it recently and could not find it anywhere. Only could find current spec oil.
I like the Amsoil HD Marine 15w-40. It's a full synthetic, and has 1267 ppm Phosphorus, and the Zinc level is 1377 ppm.

The Schaeffer's 9000 is also very good, and has 985 ppm Phosphorus and 1190 ppm Zinc...and includes a good dose of Moly. The 9001 series may be even better than that.

--Eric
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