Zerex G05 Antifreeze Coolant Concentrate 1 Gallon

Zerex G05 Antifreeze/Coolant Concentrate is a Valvoline-formulated, HOAT-based coolant designed to protect modern engines from corrosion, freezing and boiling when mixed to recommended ratios.

Designed as the OEM-approved choice for many Ford, Chrysler and Mercedes-Benz vehicles, Zerex G05 combines virgin ethylene glycol with Hybrid Organic Acid Technology (HOAT) to deliver long-lasting protection for gasoline and diesel engines. Its low-silicate, phosphate-free formula shields aluminum and other cooling system metals while additives defend diesel cylinder liners and help prevent hard-water deposits. Use the concentrate as a top-off or for a complete cooling system service to keep radiators, water pumps and hoses operating reliably.

How do I mix Zerex G05 concentrate for the climate where I drive?

Mix the yellow concentrate with clean tap or demineralized water to achieve freeze and boil protection appropriate for your region. Common mixing ratios provide clear performance ranges so you can choose the concentrate blend that matches local winter lows and summer highs.

• 50/50 mix: protection roughly -34°F to 265°F — general year-round use
• 60/40 mix: protection roughly -62°F to 270°F — colder climates
• 70/30 mix: protection roughly -84°F to 267°F — extreme cold environments

Will Zerex G05 harm my engine parts, gaskets or plastics?

No — this formula is engineered to be compatible with modern cooling-system materials. It uses high-quality additives that protect metals and help preserve rubber, plastic components and gasket materials, reducing risk of leaks and premature wear when used as directed.

• Hybrid Organic Acid Technology protects aluminum, cast iron and other metals
• Low-silicate, phosphate-free chemistry reduces deposit formation
• Additives formulated to avoid damage to hoses, seals and plastic parts

Is Zerex G05 suitable for both gasoline and diesel engines?

Yes — Zerex G05 works for gasoline and diesel applications and includes corrosion and cavitation protection tailored for diesel engine cylinder liners. It’s batch-tested and fleet-proven to meet the demands of both passenger vehicles and heavier-duty equipment.

• Nitrite content protects diesel cylinder liners from cavitation
• Deposit control agents help prevent scale from hard water
• Proven in lab testing and real-world fleet service to extend component life

How long will a full service using Zerex G05 last?

Zerex G05 is a long-life coolant formulated to provide extended protection compared with conventional formulas. Follow manufacturer service intervals and mixing instructions to maximize life and maintain warranty coverage.

• Formulated for long-life performance and reduced maintenance frequency
• Backed by a 5 year / 150,000 mile guarantee against freeze/boil-related engine failure
• Batch-tested production ensures consistent quality across fills

Who is this for: Valvoline Zerex G05 Concentrate is aimed at car and truck owners, fleet managers and technicians who need a robust, OEM-approved long-life coolant for modern gasoline and diesel engines. Choose this 1-gallon concentrate if you want a flexible mixing option to match local climate conditions, reliable protection for aluminum and other metals, and a proven formula widely used in factory-recommended service intervals.

Features at a glance:

• Unsurpassed freeze and anti-boil performance exceeding industry norms
• HOAT chemistry that fights rust, scale and corrosion on all cooling-system metals
• Compatible with gaskets, hoses and plastics when mixed properly
• Clear mixing guidance for -34°F to -84°F freeze protection depending on ratio
• 5 year / 150,000 mile protection against engine failure from freeze or boil events
• Contains denatonium benzoate as a bittering agent