Valvoline Zerex G05 50/50 Antifreeze/Coolant 6x1 gal Premixed HOAT Long-Life Protection

Valvoline Zerex ZX G05 50/50 AFC is a ready-to-use, OEM-approved long-life antifreeze/coolant formulated with Hybrid Organic Acid Technology to protect modern gasoline and diesel engines from corrosion, freezing and boiling.

Designed as the top-selling OEM-approved coolant, Zerex G05 by Valvoline delivers long-lasting protection for newer Ford, Chrysler and Mercedes-Benz vehicles as well as many other passenger cars, light trucks and commercial units. The premixed 50/50 formula combines high-purity ethylene glycol with HOAT (Hybrid Organic Acid Technology) plus select additives to defend aluminum and other cooling system metals, minimize deposits, and help prevent cavitation in diesel engines. This six-pack of 1-gallon containers is ready for topping off or full-system service without additional dilution.

How does Zerex G05 protect modern engine metals?

Zerex G05 uses a low-silicate, phosphate-free formulation with hybrid organic acids that form a protective film on aluminum, iron, and other cooling-system surfaces. This reduces galvanic corrosion and slows the chemical reactions that create rust and pits, helping radiators, water pumps and heater cores last longer.

• Hybrid Organic Acid Technology (HOAT) protects aluminum and other alloys.
• Low-silicate and reduced pH minimize abrasive deposits and scaling.
• Deposit-control additives keep coolant passages clean for reliable flow.

Will this coolant work for both gasoline and diesel engines?

Yes — Zerex G05 is formulated for compatibility with gasoline and diesel applications, including engines that require nitrite protection for cylinder liners. It contains nitrites to help guard diesel liners against cavitation while still preventing corrosion across a mixed-metal cooling system.

• Nitrite content protects diesel cylinder liners from cavitation damage.
• Metal-compatible chemistry safeguards mixed-metal systems in modern vehicles.
• OEM approvals ensure suitability for many factory-specified applications.

Do I need to mix this product or is it ready to use?

The Zerex G05 50/50 AFC is supplied premixed with deionized water at a 50/50 ratio, so it’s ready to pour into your cooling system without further dilution. This concentration is calibrated to provide winter freeze protection and summer boil-over resistance right out of the container.

• Pre-mixed 50/50 formula for immediate use—no additional water needed.
• Freeze protection down to -34°F and boil-over protection up to 265°F.
• Convenient 1-gallon bottles in a six-pack for garage or fleet applications.

What practical performance guarantees and safety features does it include?

Valvoline backs Zerex G05 with a 5-year/150,000-mile protection against engine failures caused by freeze-ups or boil-overs when used as directed. The coolant also includes denatonium benzoate as a bittering agent to discourage accidental ingestion and high-quality additives that are safe for gaskets, hoses and plastics.

• 5 year / 150,000 mile protection against freeze/boil-related engine failures.
• Contains 30–50 ppm denatonium benzoate as a bittering safety agent.
• Formulated to be gentle on rubbers, plastics and original finishes.

Who is this for? Valvoline Zerex G05 50/50 AFC is aimed at vehicle owners, fleet managers and repair shops that need a reliable, OEM-approved long-life coolant for modern cars, light trucks and diesel-powered units. It’s especially suited to vehicles with aluminum engines or mixed-metal cooling systems, and for anyone who prefers a ready-to-use 50/50 premix for quick service or seasonal maintenance. Choose this six-gallon pack when you want factory-compatible protection, fewer cooling-system repairs, and the convenience of pre-diluted antifreeze/coolant.