AMSOIL® manufactures premium synthetic lubricants and filters for automotive, light and heavy duty truck, motorcycle, RV, off road, marine, personal watercraft, power sports and heavy equipment applications. Tested and proven over billions of miles of service, AMSOIL, INC. has been the leader in synthetic lubrication since 1972.

What kind of lubricants should I use in my Harley Davidson transmission?

• One of the most common questions I’m asked is what is the recommended transmission lube for Harley Davidson motorcycles, both Big Twins and Sportsters?
  • The answer is for 883cc and 1200cc Sportster motorcycles, the AMSOIL Synthetic 20W-50 Motorcycle Oil is recommended for both the engine and transmission.
  • On 1340cc and 1450cc models, the 20W-50 Motorcycle Oil is recommended for the engine crankcase, Severe Gear 75W-90 Gear Lube for the transmission and the 10W-40 Motorcycle Oil for the chaincase.
  • Please understand that you certainly can use the AMSOIL 20W-50 Motorcycle Oil (MCV) in the transmission and the primary chaincase. This is an excellent choice. There is no right or wrong choice, it is simply a matter of personal preference. If you have specific questions regarding these choices please email or call me.
• The AMSOIL 20W-50 Motorcycle oil does provide superior gear protection, meeting API GL-1 gear lube viscosity requirements for those people that choose to use it in their transmission. The AMSOIL Severe Gear 75W-90 Gear Lube meets API GL-5  gear lube viscosity requirements and is an extreme severe duty rated transmission lubricant.