My own recent experience:
I have 9,000 miles on my 09 Ultra.
I did an oil change last Friday after 3,700 miles since the last one. The bike has only seen Amsoil 20W-50 since break-in.
I wanted to try a so-called high performance semi-synthetic oil called Brad Penn (formerly Kendall).
After some 300 miles using Brad Penn, I can tell without a doubt that the engine runs noticeably hotter than with Amsoil so I'm gonna go back to Amsoil ASAP.
Brad Penn is much cheaper than Amsoil (less than 5 bucks a quart), but now I know why. Not that it's an inferior oil, actually it's the contrary, but I haven't spent all these $$$ to make my bike run cooler to have it back to square 1 because of the oil.
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