I got a gallon from the pony before I left for niagara falls and used a K&n oil filter, after 1200 miles the oil is still pretty clear, before I used a full synthetic I think it was a 4T don't remember the brand, but anyway I change mine at 3 grand whether it needs it or not, and you'd think a full syn, would last well it didn't it was HIT... so I decided to try the amsoil, and I gotta say so far I'm impressed... the bike does run smoother and cooler, and I tend to ride it a bit harder then the typical cruiser guy.... just saying... don't slam amsoil til you try it....