for years I used Amsoil and Mobil synthetic. I do not ride like I used to I barley get to take the bike out. Any how I stopped at Auto Zone to try Valvoline vh1 20w-50 they did not have any. So I figured just get some Harley Oil when I heard $35 for 4 qts of regular oil I was shocked.. I bought it but I will keep my eye out on this site for an alternative.