A type of primary oil that can b used for a Harley Fat Boy is Lucus Primary specific oil & Lucus 85/140. This can be purchased at auto repair shops.
K&N #170c
3.5 qts
2004 fatboy oil change
3.5 quarts with filter change
If on the Kickstand Oil will spill out as the Correct level should be at the bottom of the Primary Drive.. If on a Jack or Held Level with assistance Oil will not spill out.
3 1/2 quarts.
26 0z
3 1/2 quarts
The Stator plug is located on inner primary ergo: primary chaincase lubricant
20-50 wt motor oil OR HD Primary oil
with a 88b engine 3 1/2 quarts
On the bottom of the the bike, left hand side.