Found this on the Cornerspeed Forums:
http://www.cornerspeed.net/forums/vi...ght=engine+ice
Q: You are saying that "Engine Ice" is allowed at Cornerspeed events??
Answered by Instuctor Doyle: Yes, "Engine Ice Hi-Performance Coolant TM meets all the requirements of ASTM D5216 (Propylene Glycol Base Engine Coolant)", but I would prefer everyone use water and water wetter.
Again in
this thread an instuctor confims that Engine Ice is approved.