I have this exact bike. 16,000 RPM red line. It's the fastest 600 I've ever rode.
Nothing I say has anything to do with picking am oil. But I run M1 4T 10W-40. It shifts great and runs great with it. The only prob I have is by 2000 miles, the transmission gets clunky and the engine is noisier. So, sue me, but I change my oil frequently. I think these bikes can put a beating on the oil. Then, again, I ride it hard, sometimes.
Nothing I say has anything to do with picking am oil. But I run M1 4T 10W-40. It shifts great and runs great with it. The only prob I have is by 2000 miles, the transmission gets clunky and the engine is noisier. So, sue me, but I change my oil frequently. I think these bikes can put a beating on the oil. Then, again, I ride it hard, sometimes.