No.
Harley Davidson recommends it (Citco I think) but No!!! Just use the correct weight for your motor, time of year and how you ride it!
Recommended oil is 20w50
3.5 qts
Use HD oil only and if you can afford use synthetic
yes
should be 20-50 wt harley oil but check with your dealer first..
20-50w
NO
I am not sure of viscosity, but if you have Harley Davidson on your fuel tank, you should use Harley Davidson lubricants. H. D. primary and trans lube or H.D. 20/50 synthetic motor oil will work just fine.
In as much as Harley has discontinued Sport Trans Fluid and it's now an obsolete part number I think the only HD product out there is Formula+ for your use.
20/40w
yes-absolutely.