The reason HD put the diesel oil recommendation in the manual is for emergencies. If you're on the road and low on oil and need to add oil and the correct oil is not available Diesel oil is the next best thing.
I used Mobil 1 V-Twin oil for years with good results, I put a new engine in my bike and I went with Castrol V-twin oil this time, I have no complaints on either brand.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.