I'm looking to change the fluids on my 99 Fat boy for the first time. I've decided to put Mobil V twin 20w50 in the engine.

For gear oil, does anyone run the Redline gear oil? Do Evos respond well to this gear oil? The P.O. currently has Bel Ray 85w140 in it. Should I just stick with that?

Thank you

 

Short answer, yes.

 

I have used it for along time ,I like the fact that it is a different color making it easy to tell if the trans , primary or engine oil develops a leak .. .I have not noticed any performance difference other than on my 2008 Streetglide on that bike it made a big difference in finding neutral compared to the factory oil.

 

Yes to using the Redline or to sticking with what the PO used?

 

Shockproof heavy

 

DITTO! Shockproof top, ATF primary bottom.......

 

Yup. Use it and love it.

 

ATF is referring to Royal Purple oil?

 

Nope......Castrol Automatic Transmission fluid

 

No ATF stands for Automatic Transmission Fluid.
Available at your nearest auto parts store of your choice.