[quote=mikeg205;921071]I'm a convert - either Valvoline Synthetic VR-1 20W50 or Royal Purple XPR-20w-50 and a bottle of Hyper-Lube... but that's just me - Dino racing is good too.. Rotella is good oil too... my MC-OCD get's fueled by putting blue or purple oil in my Prostar..
[I have been using Valvoline V-R1 20W-50 for years because of the ZDDP rating. It has worked great for me. That was on a flat tappet though. I now have a '98 5.7 Vortec. The PO claims to have put in a 30 WT oil and I'm confused all over again. Is the ZDDP all that necessary in these engines? Some one told me that we have rollers not flat tappets in these engines. Is that so? I'm inclined to stay with the Valvoline.