Originally Posted by
hcr25
Who "approves" it for roadracing on pavement? I doubt you'll find one race club that allows it. I was told the AMA has changed their rule this year to water only. No additives of any kind.
I understand the fear of voiding your warranty. That being said from 1996 to 2010 I used water and water wetter in my race bikes. I never had a single problem from doing that. After that I've used water only.
Maybe it would be a problem if you ran it in your bike for thousands of miles over many years. In Colorado track day motorcycles get system flushes at least twice a year unless you are brave or lazy.