Zerex Extended Life Antifreeze/Coolant 50/50 Red 1 Gal — Heavy-Duty OAT Corrosion Protection

Zerex Extended Life Red Heavy Duty 50/50 is a prediluted, ready-to-use antifreeze/coolant formulated to protect heavy-duty diesel and gasoline engines from corrosion, cavitation, freeze and boil-over.

Engine cooling systems in commercial trucks, construction equipment, marine vessels and stationary power units face aggressive operating conditions that demand a long-lasting coolant. Zerex Heavy Duty Extended Life Red uses Organic Acid Technology (OAT) and high-grade virgin ethylene glycol to deliver corrosion resistance and thermal protection without the need for supplemental coolant additives when used as directed.

How does Zerex Extended Life Red protect heavy-duty engines?

This formula is designed with inhibitors that guard against pitting, cavitation and corrosion on critical cooling system metals, including aluminum. Its OAT chemistry forms a protective film on metal surfaces to reduce metal loss and scale formation, helping maintain coolant flow and heat transfer efficiency.

• OAT inhibitors reduce galvanic corrosion and cavitation damage
• Protects aluminum, cast iron and other cooling system metals
• Helps prevent hard-water scale and rust build-up
• Maintains heat transfer and coolant flow under heavy loads

Is the product ready to use, and how does the 50/50 mixture help?

Zerex Extended Life Red comes pre-mixed 50/50 with deionized water, eliminating dilution guesswork and ensuring consistent freeze and boil-over protection straight from the jug. The balanced mix prevents freezing in cold conditions and raises boil-over temperature for high-heat, heavy-duty operation.

• Ready-to-pour 50/50 ratio for immediate use
• Deionized water reduces mineral deposits and scale formation
• Prevents freezing and increases boiling point for varied climates
• Saves time during service and reduces mixing errors

How long will this coolant last in service and what maintenance is required?

When used following label instructions, Zerex Extended Life Red is formulated to provide up to three years of protection or 30,000 miles, or up to 7,000 hours of operation, without supplemental coolant additives. Regular system checks—coolant level, concentration verification and periodic system flushing—help sustain performance.

• Guaranteed up to 3 years / 30,000 miles / 7,000 hours when used per directions
• No supplemental coolant additives required when specifications are followed
• Periodic checks recommended: level, visual condition, and concentration
• Flush and refill schedules depend on vehicle manufacturer guidance

Will this product work in non-diesel applications like marine or gasoline engines?

Yes. Although optimized for heavy-duty diesel engines (Cummins, DDC, MACK, Navistar, Paccar, Volvo), the formulation is compatible with many gasoline engines, marine systems, natural gas engines and light-duty applications. Always cross-reference equipment manuals to confirm compatibility with OEM recommendations.

• Suitable for select gasoline, marine and stationary power systems
• Compatible with a wide range of engine metals without harming seals or hoses
• Consult OEM specifications for systems with specialized coolant requirements
• Not intended for use with coolants requiring different inhibitor technologies

Who is this for: Zerex Extended Life Red Heavy Duty 50/50 is intended for fleet managers, diesel technicians, equipment owners and operators who need a dependable, long-life coolant for heavy-duty trucks, vocational equipment, marine engines and industrial power units. Choose this product when you want a factory-ready, OAT-based antifreeze/coolant in a convenient one-gallon prediluted format that reduces service time and helps protect critical cooling system components under demanding conditions.