PRIMOKOOL PRIMOKOOL What is PRIMOKOOL?Is a Heavy Duty Antifreeze/ coolant 50/50 ready to use. CharacteristicsCAT EC-1 compatible for any Heavy Duty Engine, Extended Life, works with any engine, do not need water. Can be mixed with the previous coolant of the engine. UseAny Heavy Duty Engine. PRIMOKOOL SHIPS1 gallon , 5 gallon, 55 gallon drum and 264 gallon tote. Need Help with Antifreeze / coolant? We Are Experts! Contact