Don't think it's a problem, if I remember correctly some track day orgs have put it on they're 'okay' list. Actually, this is straight from STT's site for bike prep: 6) Advanced and Intermediate group riders must use water, water wetter or a non-ethyl glycol based anti-freeze/coolant. Approved Poly Glycol brands are: Evans, 7th Gear, Liquid Performance, and Engine Ice. Automotive ethyl glycol based coolants are not allowed. I'm not going to say anything other than, "Yes, it's been changed." Worse comes to worse, I poor it out and fill it with water.