The title says it all. Was using a simple synthetic 20-50, but was told a 75-90 or even an 80-140. Any suggestions?

 

What does Ultima say to use?.,,

 

Put Redline Heavy ShockProof gear oil in it.

 

http://www.spectro-oils.com/products...oducts=cruiser

 

Get a good synthetic GEAR oil for any hd tranny Most of us run a 75 -110 to 75-140 or heavy shear.

 

Always use gear oil in any transmission,it much better for longevity.

 

I run Bel-Ray 85-140. I do not believe it is better than anything else, I use it cause it's red, and that way, when the earl drips outta the pan or shovel, I know, which comparment it's coming from, and that it needs to be ignored.

Simple (?) motor oil is designed for 'sliding' properties, where as gear lubes are designed for 'shear' properties.

 

ran redline in mine

 

new Redline V-Twin Tranny Fluid is awesome. Cycle Gear stores stock it.

 

Amsoil severe gear for me.