Hello everyone,
Forgive me for my lack of knowledge but I just bought a 2012 Street Glide, and I want to replace the three fluids; Motor oil, transmission and primary. The problem I'm having is some website say "use the same fluid in all three" while others say " you must use different fluid for each because their functions and needs are different" ! So, what do I do? Also, I know everyone has their own preference, but for my model, which would be best and why? I hear redline is good but can smell pretty bad, some people say Lucas is awesome but I don't know. I guess trial and error is probably the way to go about it?

 

This is software issue area.

Post your question here.

https://www.hdforums.com/forum/touring-models-11/

Briefly, use mobile 1 20w50 in engine. Harley's Regular non detergent formula + in transmission and primary. Those two have no filter, so non detergent in an engineering spec.

Works for me since 2006. 50K and still runs like new. (I just use mobile 1 15W-50 but the 20W-50 is a motorcycle oil. Good luck.