Anyone knows any source of ZDDP additive? Cause the latest API:SN oil is not exactly suitable for flat tappet engines due to lack of ZDDP (its an anti-wear and anti scuffing additive). Many people have reported high cam wear as a result of it.
I know the STP oil treatment has it but it thickens the oil. Thus I am looking for just plain ZDDP additives.
Btw, anyone tried the Novasyn Boron CLS? I just wonder if they could replace ZDDP instead. But its quite costly though.