Valvoline Zerex G48 Antifreeze/Coolant Concentrate 1 Gal — OAT Aluminum Protection, Long-Life

Valvoline Zerex G48 Concentrate is a long-life ethylene-glycol antifreeze formulated with organic acid technology to protect engines and cooling-system metals, including aluminum.

Built from a BASF-developed hybrid carboxylate formula and refined by Valvoline, Zerex G48 Concentrate is a professional-grade engine coolant concentrate designed for extended service intervals. It mixes with water to create a fully effective coolant that resists corrosion, helps prevent scale and cavitation, and is compatible with many light-vehicle cooling systems that specify OAT (organic acid technology) performance.

How does Zerex G48 protect modern aluminum engines?

Zerex G48 uses organic acid inhibitors in an ethylene glycol base to form a protective film on metal surfaces, reducing electrochemical corrosion and pitting. It’s engineered to safeguard aluminum components common in contemporary cylinder heads, radiators, and charge-air coolers.

• Formulation includes hybrid carboxylate OAT inhibitors for aluminum protection
• Reduces electrochemical corrosion and cavitation damage
• Designed for long service life to minimize maintenance frequency

What mix ratio should I use and how do I prepare it?

Zerex G48 is supplied as a concentrate so you must dilute it with water according to the freeze/boil protection you need. A 50/50 mix gives balanced freeze and boil protection and corrosion resistance for most climates; adjust proportion for colder conditions or OEM recommendations.

• Typical recommended mix: 50% concentrate, 50% distilled water
• Use 60/40 or 70/30 for increased freeze protection in extreme cold
• Always consult your vehicle’s manual for manufacturer-specified coolant type and ratio

Is Zerex G48 compatible with other coolants and materials?

As an OAT hybrid carboxylate product, Zerex G48 provides broad metal compatibility, but mixing with different chemistry types can shorten coolant life and reduce protection. For best results, flush the cooling system before converting between coolant types and follow OEM guidance.

• Compatible with aluminum, iron, and most cooling-system materials when used correctly
• Avoid mixing with traditional inorganic additive technology (IAT) coolants without system flush
• Back-to-back conversions require complete system drain and rinse to prevent inhibitor dilution

What performance and maintenance benefits can I expect?

Zerex G48 delivers extended corrosion protection and steady coolant performance over longer drain intervals compared with conventional IAT formulas. Its concentrate format lets you tailor freeze/boil protection while reducing the frequency of coolant service when used per recommendations.

• Extended service life reduces coolant change frequency
• Consistent corrosion inhibition for mixed-metal systems
• Concentrate form minimizes storage space and shipping weight

Who is this for: Valvoline Zerex G48 Concentrate is aimed at do-it-yourselfers and professional technicians who service modern passenger vehicles with aluminum components and who need an OAT-style, long-life coolant. It’s suitable for drivers wanting durable corrosion protection and for workshops that stock a concentrated product to mix on demand to meet regional climate needs and OEM specifications.

Features:

• Reliable
• Professional
• High performance