First of all excellent thread.
I'm new to Harley Davidson and at my second oil change I put amsoil in all three holes with the amsoil oil filter as well.
I'm not an aggressive rider but do ride 80 on the highway but never rev the engine over 4,000 even when I feel agressive going throught the gears.
Anyway, I'm getting a bad lifter noise at the high end of the rev range just before shifting into the next gear. I originally thought it was the engine but after reading this thread I'm convinced it's the oil.
I'm 1200 miles away from being due for an oil change but it will be my 10,000 mile service so I'm going to take it to the dealer and have dino oil put in as I'm very curious at this point.
As it stands right now, I'm probably finished with amsoil but time will tell.
As a side note, a friend that I ride lots of mile with has a goldwing and without knowing my concern, is complaining of a lot of lifter noise until his engine warms up. He's also just started using Amsoil so we're both going dino just so we can compair.
regardless, great thread and great forum for this newbie to harley.