It depends on the model.
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.
1 qt of primary oil
sport lube 1 quart
The primary oil does three things. Lube the clutch. Lube the primary chain . And cool the stator. If Harley thought Dextron would do this, they would have recommended the use of it. Keep your Harley a Harley.
The engine uses three quarts of oil, and the Primary/Transmission uses one quart of Sport-Trans.
One quart.
What year model is this Harley or make. The oil in the primary is self contained. It's a 1982 FLHT shovelhead that shares engine oil for the primary chain. I'm removing the chain and replacing it with a belt so I need to block the lines off somehow
locate and remove your primary oil drain plug, once the fluid is removed,remove the derby cover and replace the primary fluid to the approiate level
20/50
Depends on the model. Check your manual.
remove the round derby cover from the primary. fill until the oil tries to run out. replace the cover.
3 qts 20w50 in the oil tank, about 20 oz in the tranny and 1 qt of primary lube in the primary.