[quote=Bertrand;243016]
I would not recommend a fully synthetic- my understanding is that some the additives added to the some of these oils can cause your clutch to slip[quote]
Not the case with bike specific oils in my experience. I use fully synthetic in my oil/air cooled, 4 cylinder road bike because I thrash it to within an inch of it's life and figure that I should use the best oil I can. I have never experienced clutch slip.
My DRZ gets it's oil changed more regularly and I ride that with some mechanical sympathy so I use a good quality semi.
Cost could be an issue, although I have noticed the price difference between a good semi and full synthetic oil isn't that much any more.
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