Valvoline Zerex Dex‑Cool 50/50 Antifreeze Coolant 1 Gallon — Ready‑to‑Use Orange OAT, Freeze to -34°F

Zerex Dex‑Cool 50/50 Ready‑to‑Use Antifreeze/Coolant is a pre-mixed orange coolant formulated with organic acid technology to protect modern engines from freezing, boiling and internal corrosion.

Designed and manufactured by Valvoline, Zerex Dex‑Cool is an OEM‑approved coolant intended for passenger cars and light trucks that specify an orange OAT (organic acid technology) antifreeze. This 1‑gallon, ready‑to‑use formula arrives in the correct 50/50 mix with deionized water so you can top off or refill without measuring. Its chemistry is tailored to guard metal components, keep cooling passages free of deposits, and maintain heat transfer efficiency across a wide temperature range.

How does Zerex Dex‑Cool protect my engine during extreme temperatures?

Zerex Dex‑Cool provides dual protection against freezing and boiling by combining low‑temperature freeze point suppression with high‑temperature boil‑over resistance. The ready‑to‑use 50/50 ratio yields freeze protection down to -34°F and a pressurized boiling point equivalent to safe operation under typical radiator cap pressures.

• Pre‑mixed 50/50 formula for immediate use without dilution
• Freeze protection to -34°F and elevated boil resistance in pressurized systems
• Maintains cooling performance across seasonal extremes

What corrosion and deposit protection does this coolant provide?

Formulated with organic acid inhibitors, Zerex Dex‑Cool resists rust, scale and corrosive attack on aluminum and other metals commonly found in modern cooling systems. The formula avoids silicates and phosphates, relying on patented carboxylate chemistry to keep radiators, water pumps and passages clean and flowing.

• Organic acid technology protects aluminum, cast iron and mixed‑metal systems
• Reduces scale and deposit build‑up that can impede heat transfer
• Helps extend component life by minimizing corrosion-related wear

Is Zerex Dex‑Cool safe for hoses, gaskets and plastic components?

The blend is engineered to be compatible with common non‑metal cooling system materials. It avoids amines, borates, nitrates and nitrites, and its additive package is chosen to minimize adverse interactions with hoses, seals and factory plastics when used as directed.

• Formulated to be gentle on gaskets and rubber hoses
• No silicates or phosphates that can harm sensitive components
• Batch‑tested to reduce the risk of compatibility issues

How long can I expect protection from one fill of Zerex Dex‑Cool?

Zerex Dex‑Cool is backed by a multi‑year, high‑mileage protection profile when used according to manufacturer recommendations. Its long‑life inhibitor package is intended to provide extended service intervals versus conventional coolants, helping reduce the frequency of full flushes.

• Designed for extended service life in modern vehicles
• Manufacturing and fleet testing support real‑world durability
• Comes with a 5 year/150,000 mile protection specification when applied per guidelines

Who is this for: Zerex Dex‑Cool 50/50 is aimed at vehicle owners and technicians who need an OEM‑approved, ready‑to‑use orange OAT coolant for GM, Ford, Chrysler, Saab and other applications specifying Dex‑Cool style antifreeze. It’s well suited for anyone performing radiator top‑offs, system refills, or coolant service who wants long‑term corrosion and temperature protection without mixing or special additives.