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Message: <blockquote data-quote="musclehedz" data-source="post: 121926" data-attributes="member: 1033"><p>I'm on Royal Purple Racing 41. Done 11,000km on it up-todate. Still not drained. Engine still revs hard and smooth, no fumbling or whatsover, early morning cold start, 1 crank engine starts up smoothly and steadily. Only thing I don't like is the COST. It's expensive RM96/quart. You do the math. Another thing is that RP Racing XX is not API certified, because it contains load of zinc for boundery layer lubrication for protection but it damages the cat con and also emits very harmful exhaust gasses. It's a Racing oil so it's meant for racing, who the hell cares about exhaust gasses or the cat con... one exception for this oil is that it's a Racing formula oil that contains detergants so that is can be used for daily street driving. Racing oil contains very less amounts of detergants as after a race, the oil will be drained so there is no need for large amounts of detergants.</p></blockquote><p></p>