I received the following information from the Royal Purple oil folks.
Best--Michael Oritt
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"The reduced ZDDP levels effect only the 0W20, 5W20, 0W30, 5W30. 10W30 API
SM rated service classification Gasoline engine oils and also now the new CJ-4
Diesel engine oils which were implemented to protect the catalyst in the
exhaust systems.
RP has continued to make API SL licensed oils which have roughly 35% higher
ZDDP than the SM oils, as well as the RP MaxCycle line of oils which are made
to older API SG specifications and then our most robust oils, the XPR line
of products which have roughly 250% more ZDDP than the SM oils.
Additionally, all of RP products contain our Synerlec additive package which
gives the oil 300% increased oil film strength without relying on the amount
of ZDDP in the formulation for metal to metal protection in such high load
areas as a flat tappet cam."
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