Wasting $$$ IMO. The HD touring service manual maintenance schedule says the engine oil should be changed every 5,000 miles and the primary oil should be changed every 10,000 miles and the transmission oil every 20,000 miles.
It doesn't hurt to change the oil early especially the engine oil but you don't need to do the primary or trans as often.
You should put 75w90 or 75w140 gear lube in the trans it is better than using engine oil.
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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.