Ok If your 650 has a dry clutch like the 400 has then your oil choices appears much more open.  Remember the primary reason we use special motorcycle oils is for the increased friction that must be present for the "wet clutch" to not spin the clutch plates.  At least that is the theory.  Less friction means less wear on engine parts.  It follows then the engines runs longer between overhauls with less friction.  Yes there is some other trace elements that may not be friction modifiers in motorcycle oil, there usefullness is a matter for engineers to debate.   With regular motorcycles with wet clutches  the engine oils I used were motorcycle mobil 1.  In my atuomobiles, and trucks I use auto Mobil 1.  It follows then that auto Mobil 1 should work fine in the 650 and 400 burgmans since no wet clutch.  Thinking about this more the people to ask would be Ducati owners the majority of which models are dry clutch designs.

I hope I did not muddy the issue for you

Keep the windshield up best wishes.

Green Arrow 2008 Red 400K8

My scoot is coming up on 3500 miles and I've decided to take a crack at changing the oil myself. 

Just wondering what your choice of oil is.  Is there a particular brand you use which you feel is superior for some reason.  We just had a customer (at my RV dealership) who had us put AMZOIL in his motorhome.  My sales manager uses synthetic oil in his Acura…Geez…I'm confused.

Anyone got a suggestion…

Thanks,

Tom