Zddp

[bmxmon]

Originally Posted by fender leo

i've been reading with enthozziasm..about old engines and modern oil......there isn't enough zddp in the modern oil, to properly lubricate the cam and hyd. flat tappet lifters
who is using what for oil, and oil additives to boost the zinc content?

From what I can recall I believe it is most critical on cam break-in. Might not be a bad idea to run additive on every oil change though.