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I'm runnin' redline 10w40. works great!
I have run mobil 1 10w40, honda hp4 10w40, spectro 10w40, golden spectro 10w40 and they all work good. I would stick to 10w40 unless your bike runs hot or your driving around in the summer in stop and go traffic.
 

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I run Motul 5100.
 

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I've always used Golden Spectro Semi-Synth with great results. Of course, if you change every 1500mi like I do, nearly any oil should work just fine. In my past experiences, full Synth's have given way to clutch slippage.
 

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Synth oils are probably the best thing you can feed one of these oil-cooled engines... they're very stable over a wide range of temps and typically don't lose properties as quickly as the dino-base oils do.

The only "downside" to them is that they lubricate so well that some wet-clutch bikes can't handle them well- my Bandit1200, for instance... I'd definitely be running a synth oil (and probably will once I upgrade to a lockup clutch) but the clutch pack doesn't have enough torque capacity to hold the engine when synth is in the sump.

So yeah, there are cases where synth oils aren't a good choice- but it's more due to shortcomings of the bike than of the oil.

Ed

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