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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 night 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!



There have been literally thousands of tests done that have shown that ZDDP is an effective anti-wear oil additive. While there are certainly many different factors other than ZDDP-content that will effect wear, the zinc content was something that we could easily determine with ~1% uncertainties using NAA. EP tests are notorious for high uncertainties.




ZDDP content is easy to determine, but what about measuring the different factors other than ZDDP contant that will effect wear.

I sounds like ZDDP is not 100% resistant to other things in the oil? Gibbs says detergents effect ZDDP anti wear capability. So can we measure how much effect this has on the ZDDP in a certain oil?

Is ZDDP the only known anti wear additive?