GM Original Equipment™ Engine Cooling System Tracer Dye by ACDelco®. Volume: 1 oz. Color: Fluorescent Yellow Green. Orange - HOAT ethylene glycol. For Power Electronics Cooling System. Meets Specifications: 6277M ASTM D 3306 ASTM D 4985. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost.