To me it depends on what you use your car for as to what oil you buy and how much you should pay. If you use your car as a daily driver pretty much any full synthetic will be fine such as a castol edge, pennzoil platinum, etc. For a car you use at the strip or a car you put very few miles on in a year than it would probably be worth using the Royal Purple.

 

Yea, it's my daily driving car, I put Castrol Syntec. Prolly gonna try Edge on my next change.