Tag Archives: dialkyldithiophosphate

The Debate Over Reduced ZDDP and Wear Protection   Do modern motor oils formulated with reduced zinc and phosphorus anti-wear additives provide adequate engine protection? It’s a question some industry insiders, auto enthusiasts and motorists have been asking for years. And as engine builders and classic-car owners continue to experience engine failures they attribute to […]

Flat-Tappet and Camshaft Lobe Lubrication This is the Technical Service Bulletin relating to AMSOIL’s main high zinc and ZDDP oils as discussed on a recent video posted on YouTube. OBJECTIVE: Provide facts outlining the lubrication requirements of flat tappet camshaft engines and the importance of higher levels of zinc and phosphorus. ISSUES: Flat-tappet camshafts undergo […]