Valvoline Zerex G48 Concentrate Antifreeze/Coolant 1 gal — Hybrid OAT formula, aluminum protection

Valvoline Zerex G48 Concentrate is a premium, hybrid carboxylate ethylene-glycol antifreeze/coolant designed for long-lasting protection of engine cooling systems, including aluminum components.

Developed in partnership with BASF AG, this concentrated ZEREX G-48 formula blends organic acid technology with an ethylene glycol base to deliver corrosion control and extended service life. Because it’s a concentrate, you dilute it to the manufacturer-recommended ratio for your vehicle, giving you flexibility for seasonal tuning, top-ups, or full-system flushes. The hybrid carboxylate design provides stable protection for a variety of metals used in modern cooling systems, helping to reduce scale and corrosion without frequent replacements.

How does Zerex G48 protect modern engines?

ZEREX G-48 employs advanced organic acid inhibitors that maintain a protective film on metal surfaces, slowing corrosion and preserving thermal transfer. The ethylene glycol base also provides freeze and boil-over protection when mixed to the correct concentration.

• Protects aluminum and other typical cooling-system metals
• Organic acid technology minimizes deposit formation
• Designed to keep heat-transfer surfaces clean for efficient cooling

What does 'concentrate' mean and how should I use it?

As a concentrate, this product must be mixed with distilled or deionized water to reach the correct protection level — follow your vehicle maker’s instructions for the proper ratio. Using concentrate lets you tailor freeze/boil protection to climate and performance needs, and simplifies maintenance when topping off after a flush.

• Mix with water per vehicle manufacturer guidance
• Allows custom freeze/boil protection depending on concentration
• Ideal for full-system fill or controlled top-offs after service

Will Zerex G48 work with my existing coolant or in mixed systems?

ZEREX G-48 is a hybrid carboxylate formula intended to be compatible with many modern OEM coolants, but mixing different coolant chemistries can reduce corrosion protection. For best results, flush the cooling system and refill with the recommended mixture of G-48 concentrate and water when switching coolant types.

• Compatible with many modern cooling systems when used correctly
• Flushing recommended before changing coolant chemistry
• Use manufacturer guidance to avoid chemistry incompatibilities

How does Zerex G48 help in routine maintenance?

Using a concentrate like ZEREX G-48 makes scheduled maintenance more straightforward by extending service intervals compared with older inorganic formulas. Its stable organic acid package supports long-term protection, reducing the frequency of full coolant changes when maintained per service recommendations.

• Extended service life compared with traditional IAT coolants
• Suitable for routine flush-and-fill maintenance cycles
• Helps maintain system cleanliness to prevent overheating

Who is this for: Valvoline Zerex G48 Concentrate is aimed at vehicle owners, professional mechanics, and fleet managers who need a high-quality, OEM-compatible concentrated coolant for cars and light trucks with aluminum components. It’s particularly useful for anyone who prefers to control freeze/boil protection by mixing concentrate to suit local climate or who wants an extended-life coolant backed by industry development from BASF and Valvoline.

• Reliable
• Professional
• High performance