No.
You can use the same oil that you use in your motor
should be 20-50 wt harley oil but check with your dealer first..
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!
Use HD oil only and if you can afford use synthetic
Recommended oil is 20w50
yes
80/90 semisynthetic hypoid gear oil is what the factory put in it but I use Red Line Heavy ShockProof fully synthetic gear oil. Not cheap but neither was your Harley.
we use 20/50 of any brand you choose.
3.5 qts
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.
20-50w