Now that i'm changing my own and saving a ton or money...
Case and critical fasteners every 3,000 - Primary, trans, clutch adjust, and rear tire every other service. Front tire every other rear tire. Brake pads every other front tire. (Unless something gets worn out before that)
Using Spectro 20/50 in the case with K&N filter, Spectro 75/140 in the prim/trans.
Out of interest:
Had a service done on my Sportster (2009 model)a few weeks ago. Had Mobil 1 in it from the last oil change which I did. The guys at my dealership are really nice lads but they do not accept oil from customers to put in the bikes - I could have a big fight about it but I don't want to.
So - it's dino HD oil.
I have Mobil 1 20/50 in my garage which I will put when I do the next oil change myself in about 2.5K miles.
I don't think it's a big deal in the modest temps of England to run dino for a cupla thousand miles but knock me down guys if I'm wrong :hii