Decided to do my own maintenance. I'm a former auto mechanic, but bike fluids are new to me - just want to make sure I'm at least using the right types of fluids. Will the following work for a twin-cam bike:

Engine: Mobil 1 (20/50?)
Trans: ATF or Mobil 1 (weight?)
Primary: 85/140 Gear Oil (Torco?)

I've seen threads mention using Mobil 1 in all three, ATF in the primary but not the trans, etc. - what's the correct solution other than going directly to HD fluids?

 

I'm partial to Amsoil for all of it. Amsoil is a cut above IMHO.

 

Engine: Any good 20W-50, i.e. HD360, Syn3, M1, Redline, Amsoil, VR1, etc.
Tranny: Synthetic 20W-50, gear oil (pretty much any viscosity), or Formula+
Primary: NO GEAR OIL. Formula+, ATF, Rotella T 15W-40 HDEO, 20W-50, or other primary-specific lube like Redline MTL.

These are just a few suggestions- others will no doubt follow...