When I first started on this web site we were discussing Amsoil which i am a user. I have used it in my 08 xl1200c since it was new, its getting ready to turn 30k miles. I believe Glider said the clutch would start to slip from using it, not so. Secondly was told not to use the amsoil EA filter as it was to fine for the sportster and would cause engine damage, not so. Sportster is mechanically perfect in every way No ill effects as was told would happen. Have a report on my softail that will post in another thread.