Zerex Dex-Cool Antifreeze Coolant Concentrate 1 Gallon

Zerex Dex-Cool Antifreeze/Coolant Concentrate (1 gallon) is an orange organic-acid coolant designed to protect modern passenger cars and light trucks from corrosion, freezing and boiling when mixed to the recommended ratios.

Valvoline’s Zerex Dex-Cool is an OEM-approved concentrated coolant formulated with carboxylate organic acid technology (OAT). Its silicate- and phosphate-free chemistry is engineered to work with aluminum and mixed-metal cooling systems found in GM, Ford, Chrysler and SAAB vehicles that specify an orange OAT fluid. Use it as a top-off or for a full system refill after flushing to help maintain proper heat transfer and reduce common causes of cooling system failure.

How does Zerex Dex-Cool protect my engine components?

Dex-Cool’s organic acid inhibitors help control corrosion and scale, extending the useful life of radiators, water pumps and thermostat housings without relying on silicates or phosphates. Its formulation resists the build-up that can restrict coolant flow and reduce cooling efficiency.

• OAT chemistry tailored for aluminum and mixed-metal systems
• Resists rust, scale and deposits that impair heat transfer
• No amines, borates, nitrates or nitrites that some systems avoid

What mixing ratios and temperature ranges should I follow?

The product is a concentrate and must be diluted with clean tap or demineralized water. Different water-to-concentrate ratios change freeze and boil protection, so match the mix to your local climate and vehicle requirements.

• 50/50 mix: effective roughly from -34°F to 265°F (recommended for many climates)
• 60/40 mix: extends freeze protection to about -62°F and boil protection to ≈270°F
• 70/30 mix: for extreme cold, protects to approximately -84°F while maintaining high boil resistance

Is Zerex Dex-Cool compatible with seals, hoses and other non-metal parts?

The concentrate is formulated to be safe with common cooling system materials when used as directed. Additives are chosen to minimize adverse reactions with gaskets, hoses and plastics while still delivering corrosion control for metals.

• High-quality additives designed to avoid harming elastomers and plastics
• Helps reduce leaks by controlling corrosion-related deterioration
• Contains a bittering agent (denatonium benzoate) for safety

Who is this for?

Zerex Dex-Cool concentrate is suited for owners and technicians servicing GM, Ford, Chrysler and SAAB vehicles or any modern car and light truck that specifies an orange OAT coolant. It is appropriate for routine top-offs, coolant flushes and full system refills when you need a silicate- and phosphate-free formulation that’s batch-tested in the lab and fleet-tested in real-world applications. Follow your vehicle maker’s coolant specifications and mixing instructions to ensure optimal compatibility and performance.

Key features summary:

• OEM-approved orange OAT concentrate for many passenger cars and light trucks
• Protects against freeze-up, boil-over, corrosion and deposits
• Silicate- and phosphate-free; no amines, borates, nitrates or nitrites
• Mix with water at 50/50, 60/40, or 70/30 depending on temperature needs
• 5 year / 150,000 mile protection against engine failure caused by freeze or boil conditions when used per directions