Valvoline Zerex G05 Antifreeze Coolant Concentrate 1 Gal — HOAT protection for aluminum & diesel cavitation

Zerex G05 Antifreeze/Coolant Concentrate is a long-life, HOAT-engineered coolant from Valvoline designed to protect modern engines against rust, deposits, freezing and boiling.

Zerex by Valvoline is an OEM-approved coolant line formulated for newer Ford, Chrysler and Mercedes-Benz vehicles and is suitable for both gasoline and diesel engines. This one-gallon concentrate combines high-purity ethylene glycol with Hybrid Organic Acid Technology (HOAT) and targeted additives to guard aluminum and other cooling-system metals, minimize deposits and help prevent cavitation in diesel cylinder liners. Use it for topping off, routine maintenance or a full system flush to preserve radiator and pump performance.

How does Zerex G05 protect modern engine cooling systems?

Zerex G05 uses HOAT chemistry and corrosion inhibitors tailored for mixed-metal cooling systems, including aluminum components common in newer cars. Its balanced formulation reduces scale and maintains fluid flow so parts run cooler and last longer without aggressive silicates or phosphates.

• Hybrid Organic Acid Technology protects multiple metal types, including aluminum.
• Low-silicate, phosphate-free formula reduces deposit formation.
• Deposit-control additives prevent hardwater scale on radiators and passages.
• Nitrite content helps shield diesel cylinder liners from cavitation damage.

What mixing ratios and temperature protection should I expect?

The concentrate must be mixed with clean tap or demineralized water; different ratios give predictable freeze and boil protection. Choose the dilution that matches your climate and vehicle recommendations to achieve the intended protection range.

• 50/50 mix: effective from about -34°F to 265°F (approx.).
• 60/40 mix: increased protection around -62°F to 270°F.
• 70/30 mix: maximum freeze resistance near -84°F and boil protection to 267°F.
• Always follow vehicle manufacturer guidance and local climate needs.

Will Zerex G05 harm gaskets, hoses or vehicle finishes?

Zerex G05 concentrate is formulated to be compatible with common cooling system components and exterior finishes when used as directed. It contains additives designed to prevent leaks and is free of harsh ingredients that can accelerate gasket or plastic deterioration.

• Safe for hoses, gaskets and typical cooling system plastics when properly diluted.
• Non-aggressive to original vehicle paint and exterior surfaces in normal use.
• Includes anti-leak protecting additives to reduce minor seepage risks.
• Contains a bittering agent (denatonium benzoate) for safety handling.

How durable is the protection and what testing supports it?

Zerex G05 is engineered for long-life service and backed by lab batch testing plus fleet use to validate real-world performance. It carries a practical guarantee covering engine failure from freeze or boil issues under specified conditions, reflecting confidence in its protective profile.

• Designed for extended service life—helps reduce maintenance frequency.
• Batch-tested in laboratories and validated in fleet operations.
• 5 year / 150,000 mile coverage against engine failure from freeze-ups or boil-overs (see manufacturer details).
• Formulated to meet OEM approvals for multiple vehicle makes and models.

Who this is for: Zerex G05 is a practical choice for mechanics, fleet managers and vehicle owners who operate Ford, Chrysler, Mercedes-Benz or mixed-metal cooling systems and need a long-life, OEM-aligned coolant. If you service gasoline or diesel engines and want a concentrate that balances corrosion protection, deposit control and temperature resilience, this Valvoline Zerex G05 gallon bottle provides a flexible, proven option for routine maintenance and full system service.

Features summary:

• Exceptional freeze and boil resistance beyond standard benchmarks.
• HOAT formulation fights rust, scale and corrosion on all cooling metals.
• Compatible with gaskets, hoses and typical plastics when diluted correctly.
• Adjustable mixing ratios for different temperature ranges and climates.
• 5 year/150,000 mile protection against engine damage from freeze/boil events.
• Lab batch-tested and fleet-proven for dependable, long-life performance.
• Includes denatonium benzoate (30–50 ppm) as a bittering safety agent.