Quote: Joe Gibbs is another company that says the ultra-high detergent levels in Diesel oils harm the effectiveness of the ZDDP.
R.
So there is the first comment I've heard about the effectiveness of the ZDDP. And indication that a high number on a chemical test may not correlate with the effectiveness (actual use).
Here's a novel thought...How about get tests on the actual Extreme Pressure (EP) wear? If you are worrying about cam lifter wear, test for that wear. Who cares what chemicals are in it, see if it works!
