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Old 05-26-2011, 08:45 AM
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Re: Royal purple questions

My engine ran much rougher and louder using RP; I even used it for 3 oil changes before changing to Valvoline synpower, and the engine runs far smoother and quieter now. I would never reccomend RP for any modern engine after my experience. If it were any better than other oils, you would see at least one NASCAR, F1, Indy, ALMS, Rolex,,,team using it to gain any advantage, but not the case.

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  #14  
Old 05-26-2011, 08:59 AM
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Re: Royal purple questions

BTW you don't have MDS if you have a 2006 4.7
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