Wanted to change over at 5000 service but the dealer had the oil & filter changed before I told them I wanted synthetic. So...I waited till 10,000 and did it myself. Amsoil 20W-50 all three holes.
Tried Synthetic in my 03 classic Too much engine noise ,went back to Hd oil an lucas additive in all 3 holes . Find this to be a lot quieter