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Old 04-10-2012, 01:39 AM   #10
Mach828
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Join Date: Nov 2009
Location: Albuquerque, NM
Posts: 5,759
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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