Hey all... I was wondering if today's CJ-4 HDEO lubes have enough anti-wear additives to protect older engines with flat tappet cams? I know that the CJ-4 HDEO's have reduced amounts of certain additives compared to older CI-4 version. I got asked this question today by a friend who has an older muscle car with a flat tappet motor. He was told that he should still run a ZDDP additive with a current CJ-4 lube if he chooses to run a diesel motor oil. Are CI-4 oils even available anymore besides from Amsoil?

Edited by Ponch (01/04/14 11:03 PM)