Tag Archives: zddp

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 […]