Re: oil

Posted by Owen_Dyneto On 2015/7/19 9:47:53

According to data I've seen published, the reduction in ZDDP for Rotella T from the prior CI-4 grade to the current CJ-4 grade was from about 1200 ppm to about 875 ppm. Given that Packards have such very low cam/tappet follower loadings it's really not of any consequence - engines of these types were quite long-lived even before the introduction of ZDDP into motor oils. So in my view it's like most all of the snake oils and cures in a bottle, "might help, can't hurt" situation. What can hurt though and even be destructive of your engine is to add more ZDDP to an oil that already contains it! Beyond some point more is NOT better!