zddp
zddp
(OP)
My understanding is that for ZDDP there is a Primary and Secondary used for Car Oil acting at different pressure/temp. If there are 4+ different types of ZDDP, and AW and oxidation properties vary between types, is there a variation in mix for different uses ie normal road, diesel, race.





RE: zddp
the amount needed for different types of engine and operating conditions will of course vary. in racing oxidation is not the biggest problem, because usually the oil is changed quite frequently. what you do need is the antiwear protection because usually high revs are involved. in a typical truckengine the antioxidant capability is usually much more important because of the extended drain intervals, whereas the revs are usually modest.
if you choose the right type of oil for the type of engine employed, you should be ok - if in doubt use an oil according to the latest API or ACEA spec.
RE: zddp
My experience is that road racing applications don't respond strongly to AW because most of the time is spent in the hydrodynamic regime, whereas off-road applications with more slow & go do.