Originally Posted by TNathe

here's a logical question. How do we know the Royal Purple is the "HOT SHIT" compared to the other brands like Valvoline etc.? has there been any hard data confirming that Royal Purple is the good stuff or is it just because it is expensive, therefore it must be good. I beat the piss out of my LSD with factory recommended weight Valvoline. No problems here yet and she has 110,000 mile on her. Jsut wondering if anyone can provide facts that stand by the claims that Royal Purple is "all that and a bag of *insert random shit*".