+1 here on Shell Rotella T6 ( in the blue jug of course ).On my '10 the manual allows 10w30 or 10w40 depending on temps. That said, I live in Charlotte NC, I ride year round and use a Full Synthetic 5w40 year round. I change oil and filter at 5-6000 miles under normal conditions though the owners manual allows considerabley longer and on longer trips I have gone longer. I do notice that once I am over 6,000 miles the bike will use a little oil and the time I went 8,000 miles I added about a 1/2 qt.
The brand I use is Shell's T-6 full synthetic (really a turbo deisel product) because it has the Jaso MA certification and can be bought at Walmar in 4 qt containers for $20. Their organic Rotella for turbo deisels has that cert. also and 4qt's is about $14. Neither is "energy conserving" or "high mileage" designates so they are safe for our wet clutches. Not trying to tell you to pick a brand, just sharing what has worked well for me over the last 200,000 miles on my last three bikes.
Give me a shout. Co-worker lives in Stephen City, rides a Fat Boy ? That would give me two reasons to head that way.Hey Chop, used to live in Stephen City and work in Winchester. Still have gfriends up that way and visit so maybe we'll get a chance to meet one of these times.