Shell Rotella T diesel oil. Cheap and easily available everywhere, from truck stops to Walmart. Change it every race or hard ride, or a few hours. The non-syn 15-40 W is fine, and is what is recommended by Rekluse for their clutches. I used to use the 5-40W synthetic but haven't since it was reformulated. Not saying its bad now, just have not tried it lately because my '07 is fine with the 15-40W.
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