I think syn is a good idea but I don't think the same exact oil in all 3 is a good idea.
One right tool for each specific task kind of thing.
I get some people/dealers don't want to stock 3 separate oils and having one oil that's okay across the board for each makes sense from that perspective.
Engine, primary and particularly the trans all require different things from an oil - I just don't think that it's likely HD has someone whipping up a blend that covers each as well as a purpose specific oil would in each area.
I'm sure it's "ok" for the most part - just that I'd rather go the extra step and do whats best for each.
Poking around the net more - seems like the Mobil 1 products for engine and primary with Redline for trans are highly touted.
Service manager at the dealer is an outstanding wrench - I'm going to ask him tomorrow. Heck his father in law has the world's fastest panhead and is a 5 time national champion. His wife races nitro bikes as well.
