Welcome to the forum from Oklahoma City.
You asked the million dollar question. I am still searching for an answer to which brand and type of oil to use! When I read here in the forum I get, use 20-50 for the engine, primary oil for the primary, around 85 weight and use transmission oil for the transmission, 95-140. But then I talk with Harley mechanics that tell me that is okay for the 5-speed and older but the new 6-speeds are made for the Syn-3 20w-50.
So if you ever find out a good definite answer, let me know... I just did my 5k and used the Harley Syn-3 in the engine. I had my 1k done by the dealer and they used the Syn-3 in all three holes... 2012 RGU 103 w/6-speed.
I have 8k now and my 10k will be coming up soon.
Getting the manual is a smart thing also, there are a lot of things to check on the 1k. The service manual covers it in detail, more so than the owners manual...
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2012 Road Glide Ultra
Big Blue Pearl, RC Exhaust, Sweet Ride