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Amsoil, Redline, Royal Purple and Mobil-1 are all Top Shelf Group 4 synthetic oils. Pick whichever is easiest to find and has the best price. For me, that's Mobil-1. It's available at Autozone, although sometimes you have to ask for it. It's often kept in the back room.
I recommend Amsoil
Mobil 1 user recommends Mobil 1
Royal Purple user recommends Royal purple
Redline user recommends Redline
It never ends
I use Mobil 1 on all my vehicles, is Amsoil better? I don't even know. I know a wholesaler here, a litre of Amsoil costs me $8, so I take it.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.