Harley Requires 5 MICRON Filtration.
Harley Filters are no higher than Honda filters and if you get the Black one it's only
7 bucks.
The only oil requirement is that you run Diesel Grade Oil.
Like Rotella T Synthetic or Dino Oil at 20w/50 Diesel Grade, I am betting you could get away with
15w/40
though.
Harley Oil is 6 dollars a quart for the 20w/50 360 Brand Oil, which I run all year.
Primary to be changed every 10,000 miles use Formula F from Harley, it just takes a Quart and 4
ounces.
The Tranny is good for 20,000 miles and use either Formula F Harley or Belray is a good alternative
but costs just as much.
1 Quart will do that tranny.
So you can save a little money on oil and a lot of money if you do it yourself.

Oil drain plugs torque at 14 Ft. Lbs to 21 Ft. Lbs.
Use of a new oring every time is not warranted.
A little piece of card board under the filter will keep the oil off your bike when changing your filter.
Big AL