No way to change it, I'm sure your post will get a lot of views though..lol. Keep using the Amsoil if you are getting it for cost, it sure doesn't hurt. I really think you need to flush it at least one more time though. Then do a 2k run as I said before. You don't want to spend too much money on a 500k engine. You will get a good idea after another flush and run. I promise.