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SUNOCO HEAVY DUTY EXTENDED LIFE COOLANT is a nitrite-free, ethylene glycol based coolant/antifreeze that features a proprietary organic acid technology formula designed to provide complete protection to heavy duty diesel cooling systems and is available in a concentrate or 50/50 premix. 


SUNOCO HEAVY DUTY EXTENDED LIFE COOLANT is a nitrite-, phosphate-, silicate-, and borate-free formulated coolant that provides outstanding acid corrosion inhibitors. Designed for long-lasting wet sleeve liner cavitation and all cooling system metals protection for 1 Million miles of on-road, or 20,000 hours of off-highway, use without the need for additional extenders required by other products. Sunoco Heavy Duty Extended Life Coolant has a proprietary formula that eliminates the need for chemically charged filters, top-off additives and inhibitor testing. 


SUNOCO HEAVY DUTY EXTENDED LIFE COOLANT is designed for all heavy duty cooling systems, on-road or off-highway, where protection is paramount. This includes OTR tractor/trailers, backhoes, frontend loaders and other construction and agricultural heavy duty diesel equipment.

50/50 = Protects down to -37°F and up to 265°F


Navistar CEMS-B1-TYPE IIIa • CAT EC-1 • Cummins CES 14603 • Detroit Diesel 93K217 • MTU 5048 • Mercedes DBL 7700, 325.3 • MAN 324 TYP SNF • Behr Radiator • ASTM D-6210 • John Deere • Volvo/Mack • TMC RP 329 • PACCAR 





Specific Gravity 60/60°F

1.070 - 1.080

Freezing Point, 50% vol


Boiling Point, 50 vol.%, °C


pH, 50% Vol

7.8 - 9.0

Reserve Alkalinity

4 min.

Chloride, ppm

less than 25

Silicon, ppm

less than 10