There are a number of different Mobile 1 fully synthetic oils. My dealer (40 miles away) suggested Mobil 1 15/50 (as one of a few brands) to top off my bike. They use only 15/50 synthetic in their shop on the bike. I only could find one Mobile 1 in that viscosity. It is labeled: Mobil 1 Extended Performance 15W-50. It was the only 15W-50 I found at AutoZone or O'Reilly (who had it for $7.50). I was in a hurry and didn't try other bike shops or Wal-Mart.
I'm getting my oil changed next week (4 year service) and my breather/seal replaced. I'll bring back a quart of what they use. Hopefully, with my oil use problem fixed, I won't have to add anything significant between yearly changes.
My first quart I got from them when I bought the bike lasted over 3 years and I would still have some if my crankcase breather hadn't have screwed up.
