Correct engine oil.

[Butch Cassidy]

Dogs, Harleys, Indians.
I use Mobil 15-50 synthetic in the engine, 1/2 Qt. low, ATF type F in the primary, 85-140 in the trans.
John

Exactly

 

[john sachs]

Are you sure ? I can't see what purpose that would serve especially in a 3qt system.

I run 1/2 qt. low engine oil. Just a habit. Heat expansion in an air cooled engine is also a consideration. Between the sump, and oil cooler, it's hard to drain all the oil out. Roller bearing engines don't need oil pressure like plate bearing engines, plus the V-Twins have excellent oil delivery to the lifters, and top end. A little less oil also lessens the chance of wet sumping.
John