Since we are talking about the use of non-Harley lubricants I just wonder what is so special about Amsoil that makes it better than Mobil 1 V-Twin which I have used for years with no problems. Mobil was the industry leader in the development of synthetic lubricants and that is the main reason I choose their oil.
Check the history of Amsoil before you bash it. Mobil didn't have a syn oil for years after Amsoil - check it out - 1970 for Amsoil and 1974 for Mobil1. I've used many different brand name syn oils (even Syn3) and have never had an oil related problem.....EVER!
Don't get me wrong, Mobil1 is a very good oil as are other brand name syn oils. I just prefer Amsoil. Whenever a brand name syn oil goes on sale (for a great price) I will buy a case. Right now in my garage I have a few bottles of BelRay/ Mobil1/ Valvoline/ Castrol and a lot of Amsoil.
If anyone is so concerned about the oil they use, send it in for an UOA and cut out all the brand name bullsh-t everyone keeps telling you.
I've been riding motorcycles for over 60 years and have used every imaginable name brand oil, dino and syn. Changed it regularly and
NEVER had an oil related problem -
EVER!
Actually I prefer dino oil over syn, but since I'm so lazy, the long change out interval I get with syn wins.