Shell HD Phosphate Free Antifreeze/Coolant 50/50 [1.00-gal./3.79-Liter. Jug] 550049185

Shell HD phosphate-free antifreeze/coolant 50/50 (part 550049185) is a premium heavy-duty coolant formulated with ethylene glycol and organic acid inhibitors for long-lasting protection in diesel, gasoline, and natural gas engines. Free of phosphates, silicates, borates, and nitrates, the product prevents corrosion, liner pitting, and thermal degradation across aluminum, cast iron, brass, steel, and solder. Designed for mixed-metal cooling systems, it maintains optimal heat transfer and resists burn-through. Meets ASTM D6210 and OEM coolant requirements. Perfect for trucking fleets and equipment operators seeking dependable, extended-life coolant—sold in a 1-gallon jug through Wofford Truck Parts.