Re: switching from mobil 1 to Royal Purple
5w-20 is too thin. I'd at least get 5w-30 Royal Purple if thats what you want.
Lower the second number is, the more wear your causing on your engine at higher operating temps. And only benefit is your probably saving .25mpg and getting an extra 1hp.
With your car being boosted and everything, I wouldn't be running 5w-20. Its your car though!
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods.
Tuned by me with SCT Advantage
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