Should I Use 20W-50 or Gear Lube in My Harley Transmission?
Update- April, 2026– AMSOIL now offers a dedicated V-Twin Synthetic Transmission Oil. The AMSOIL V-Twin 20W-50 and the dedicated V-Twin Transmission Fluid offer identical transmission performance and protection. AMSOIL no longer lists the Severe Gear products as secondary transmission fluid options as suggested in this article. Related: Correct Oil For Harley Primary And Transmission. Which choice…



