Prime Orange Compatible Extended Life 50/10 Prediluted Anti-Freeze/Coolant. Prime Orange is specially formulated for topping off cars and light duty truck cooling systems with Orange extended life coolant. Prime Orange is a blend of 50% antifreeze and 50% demineralized water. Meets or exceeds ASTM D3306 and D4985 standards for corrosion protection for cars and light duty trucks while providing reliable freeze-up and boil[-over protection.