oil choices
There are TDR guys who work in the oil business and they can correct this if Im wrong... . The Castrol Synth is just fine for its intended use... . I've got no beef with it. Q-State's oils are parafin-based and will gum up an engine quickly. Years ago I owned a V-6 Mazda. The old-timer tech at my local dealership advised that just topping up with 1/2 Qt of Quakerstate would gum up my lifters in a matter of a couple hundred miles and pound the valve train to death! Not good in the turbo cooler lines... . Play it safe: Delo, Rotella, Amsoil, etc... dont take chances with an expensive motor to save a few bucks. Just MHO, but sound advise, I think.