Go here, and you can read lots of opinions, rules of thumb, or "what I like is ...":
Engine Oil Poll - Harley Davidson Community
You can also see my post (#5) on the thread below. Tried to include some data, references and my own empirical data:
fluids to be changed - Harley Davidson Community
TQ
Engine Oil Poll - Harley Davidson Community
You can also see my post (#5) on the thread below. Tried to include some data, references and my own empirical data:
fluids to be changed - Harley Davidson Community
TQ