Shell's Rotella T CJ-4 in 15W-40 has the zinc and phosphorous required for your engine. It is the easest to find and not to pricey. I use Brad Penn 20W-50 which costs more and you need to find a dealer. Amsoil AMO 10W-30 for cold weather is excellent. Castrol Syntec 20W-50, Joe Gibbs Hot Rod Oil 15W-50, Mobil ! 15W-50, Valvoline VR1 20W-50, Valvoline Roush Racing 20W-50, and Valvoline Racing Synthetic 20-50 are all excellent.
STAY AWAY FROM STARBURST logo'd oil. It doesn't contain the zinc and phosporous your engine requires.
Good Luck
STAY AWAY FROM STARBURST logo'd oil. It doesn't contain the zinc and phosporous your engine requires.
Good Luck