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Originally Posted by Rob. Smith
Has any one seen or used Royal Purple ? They claim to enhance bearing surfaces and improve fuel economy as well as increase torque and horsepower.
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Rob:
I have used Royal Purple 10W-30 in the winter and 20W-40 during the summer in my 428FE now for about 1 and a half years. I change the
oil in the Cobra twice per year, once in May and again in early October.
I also am using their gear lube in the differential along with a posi lube from Amalie. In the toploader I am using the Royal Purple trans gear lube.
The
oil works well. However, the question is can you get it at a reasonable cost in Austrailia? Try
www.rpmoil.com and perhaps they can inform you who in your area carries it.