Hey Guys,
I know this always comes up once in a while what is the best oil on the market today to use in our Y-Block flat tappet engines? It gets confussing with the amount of  ZDDP, synthetic vs standard etc. My question is my 292 is bone stock and was rebuilt 8,000 miles ago bought it and changed oil 6,000 miles ago used Valvoline Syn Tec runs fine great oil pressure etc. Want to change oil and continue to use a Synthetic grade but who's? Most guys I talk to say to use oil with Zinc and an oil with the most in it.
Amsoil, Mobil 1, Shell Rotella or Royal Purple? Any thoughts or help appreciated.