Zerex Fully Formulated Pink 50/50 Heavy-Duty Antifreeze Coolant 1 Gallon — Premixed, Low-Silicate Corrosion Protection

Zerex Fully Formulated Pink 50/50 is a premixed ethylene-glycol heavy-duty antifreeze/coolant engineered to protect diesel and commercial engines from freezing, boiling and internal corrosion.

This 1‑gallon, ready-to-use coolant arrives pre-diluted in a 50/50 mix with deionized water so you can pour it straight into the cooling system without measuring. Formulated with low silicate levels and a balanced package of corrosion and scale inhibitors, Zerex targets the demands of heavy-duty diesel manufacturers — including Cummins, DDC, MACK, Navistar and Paccar — while remaining compatible with aluminum and other metals commonly found in modern cooling systems.

How does this coolant protect heavy-duty diesel engines?

Zerex uses ethylene glycol as the base and adds a blend of chemical inhibitors designed to prevent pitting, cavitation, rust and scale buildup that degrade pumps, radiators and engine passages. The low-silicate approach aligns with industry requirements for heavy-duty truck applications.

• Corrosion and scale inhibitors pre-charged into the mixture
• Reduces pitting and cavitation in vulnerable components
• Formulated for aluminum and mixed-metal cooling systems
• Contains a defoamer to minimize foam and protect seals

Is it really ready to use, and what does 50/50 mean?

Yes — this product is supplied as a 50/50 solution of coolant and deionized water so no dilution is required before filling. The premix removes guesswork, ensuring correct freeze and boil protection and consistent inhibitor concentration across fills and topping-ups.

• Premixed at factory for immediate use
• Consistent freeze/boil protection for typical climates and duty cycles
• Eliminates errors from on-site mixing with tap water
• Convenient 1‑gallon size for service or top-off applications

Will this coolant harm gaskets, hoses, plastics or painted finishes?

Zerex Fully Formulated Pink uses additives and a defoamer that are compatible with common cooling-system materials. It’s engineered to avoid degradation of rubber, plastic components and vehicle exterior finishes when used as directed.

• Safe for hoses, gaskets and plastic parts in the cooling circuit
• Formulation avoids staining or damage to original vehicle finishes
• Batch-tested in labs and fleet-tested in real-world service
• Includes denatonium benzoate (30–50 ppm) as a bittering agent for safety

How long will the protection last and what warranty applies?

When installed and maintained according to label instructions, Zerex provides long-term protection suitable for heavy-duty service intervals. The product carries a performance-backed coverage for typical operating spans encountered in commercial fleets.

• Guaranteed performance up to 3 years of service
• Coverage specified to 150,000 miles or 3,000 operating hours
• Recommended for scheduled replacement intervals in heavy-duty fleets
• Follow manufacturer and label guidance for system compatibility

Who is this for: Zerex Fully Formulated Pink 50/50 Ready-to-Use Antifreeze/Coolant is aimed at commercial truck operators, fleet maintenance shops and technicians servicing heavy-duty diesel engines that require a low-silicate, ethylene-glycol based coolant. It is a practical choice for anyone seeking a premixed, heavy-duty coolant that protects mixed-metal systems, simplifies service with a ready-to-pour 1‑gallon container, and meets the specification expectations of Cummins, DDC, MACK, Navistar and Paccar applications.