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: GodDAMNIT it's good stuff. : was running mobil 1. : switched to royal purple race41 : got better gas mileage. : smoother idle. : quieter idle. : etc..etc..OVER mobil 1.: but what do i know. : ps, it's expensive. : either oils work fine. me, Mobil1 -> RP Racing 41 -> RP 10w30(and 40), engine runs smoother than 41 for daily basis, and feels less load to move around thicker oil; but when racing the engine, the 41 feels to hold the heat better. I have only used 41 once as my first RP; don't really like it for daily, plus it's expensive. Vince hooks me up nicely with these lubricant :-) and of course, what do I know? :-)
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