We run everything on Rock Oil, including the GP bikes. We use Rock Oil products in the forks, transmission, cooling system, and for engine lubrication.
Castrol has always been my preferred alternative choice, but I've not used it [regularly] for 20 years, since I started with Rock Oil.
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Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
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