Got a 2001 dyna I'm gonna change all the fluids. Its got 7500 mile on it and am unsure what to put in it. Have done searches but still confused. I want to run synthetic in the engine if it wont make me start leaking out my old gaskets,hope it will make it run a little cooler. I'm in the midwest so have drastic seasonal temperature changes. What do you all put in you're older TC88's in all 3 holes?
thanks,Rick

 

you can still run synthetic although I would make it amsoil, mobilv twin or royal purple. Hard to say if leaks will come. It is possible although not likely.

 

Syn does not cause leaks.

 

Amsoil MCVQT SAE 20W-50....In all three.
Bike runs cooler,shifts better and goes into neutraleasier.
https://www.amsoil.com/storefront/SearchResult.aspx?CategoryID=291

 

Mobile 1 75w90 syn gear lube in the tranny
Harley Formula+ Primary lube in the primary case

Your trranny will like the gear lube
Using a lube formulated for the clutch will be a benefit in the long run in the primary. My clutch hooks up much better using the Formula+.
Amsoil, Redline, & Spectro all make formulas blended especially for the primary chain case.