Hey Guys, can anyone tell me IF it's ok to use 75/90 synthetic in the trans on a 2003 fatboy? Would it be ok to use this in the primary as well ? I would like to find a oil that I could use in both.
Run it in the trans but not the primary. You gan use atf, 10w40 or heavier engine oil just nothing that states energy conserving. 15w40 hdeo works good.
