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Originally Posted by daneboy5
I have used Royal Purple on all my cars/trucks since 1996. Before that I used Valvoline exclusively. I believe it is the best you can buy! I watched (in person) a bearing load test and Royal Purple won hands down above: Mobil 1, Redline, Valvoline, Amsoil, Castrol, etc.
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Royal Purple has very good protection qualities straight from the bottle, but get even 1000 miles on it and it is far inferior than just about anything out there. Real tests have proven time and time again that that stuff is nothing more than hype in a bottle.