Looking for some advice....... just changed the oil in my 09 Ultra, used Amsoil 20/50.... Now want to change the trans fluid, wondering what is best? Syn oil? Red Line ? Heavy? Light?


Thanks
Jet

 

There's no such thing as "best"


I use BelRay Gear Saver, and like it...... if that helps.

 

Amsoil makes a new V Twin transmission fluid or their Severe Gear 75W-90

 

I use Mobil 1 V-Twin 20w50 Syn in all three holes, does fine.
I like to keep it simple.

 

I use Red Line but is it the best, who know?

 

Any 75/90 gear oil will be fine for 10k miles...

 

There are a lot of good choices out there. I prefer Redline ShockProof.

 

+1 on Bel Ray

 

Below is a link to an article written by Bert Baker of Baker Drive train about gear lubes.
I know anything will work in a pinch but I don't know why you would want to use motor oil in your transmission when there are better options available.

http://bakerdrivetrain.com/wordpress...Drivetrain.pdf

 

I use the 75/90 Mobil 1 gear oil 22k no problems so far!! 20/50 Mobil v twin other 2holes In my 2009 ultra!!