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For my money you couldn't go wrong with the Royal Purple or the Valvoline. The Castrol is more suited to a combination engine/tranny that shares the same sump.
I would personally go with the Valvoline dinosaur rather than the synthetic, as I change fluids midway between scheduled services.
Did you know that you do not have to use specific "motorcycle oils"? A good quality 20W-50 car oil in dino or syn is more than adequate to meet your needs.
Google "Bob is the oil guy" and scroll down to the Motorcycles forum. Heaps of info there and on the whole site.
Warning-- this subject is very subjective and is like how long is a piece of string. If you do a search here you'll find out more than you need or want to know. EVERYBODY has a favorite oil and few agree on what to use.
Last edited by V2Evo96; Jul 1, 2011 at 05:54 AM.
Reason: fix smelling pistakes
aNY GOOD 15W50 OR 20W50 SYNTHETIC OR CONVENTIONAL WILL WORK FINE FOR YOU ENGINE. ANY OF THESE 3 OILS YOU MENTIONED WILL WORK...YOU DON'T HAVE TO USE A MOTORCYCLE SPECIFIC OIL AS YOUR ENGINE DOESN'T SHARE THE CLUTCH OIL LIKE METRIC BIKES...
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