PEAK DEX-Cool Antifreeze + Coolant for GM Vehicles, 1 Gallon Orange OAT, Long-Life Protection

PEAK DEX-Cool® Antifreeze + Coolant is a ready-to-use orange OAT coolant engineered for GM vehicles 1995 and newer, offering long-life corrosion protection and freeze/boil control.

This 1-gallon PEAK DEX-Cool® container supplies the orange organic acid technology (OAT) formula GM specifies for many of its models. Formulated without amines, phosphates, borates, nitrites, or silicates and fortified with a bittering agent (Denatonium Benzoate), it’s designed to preserve aluminum and other cooling-system metals while delivering up to 10 years or 150,000 miles of service life after a complete flush and fill.

What makes this coolant suitable for GM vehicles requiring orange OAT formulas?

PEAK DEX-Cool® matches the chemical profile GM requires for engines specified to use orange OAT coolant. It meets industry and OEM performance standards so it integrates with cooling systems designed around DEX-Cool chemistry without introducing incompatible additives.

• Meets ASTM D3306, D4985 and GMW3420, GM6277M specifications
• Designed for GM vehicles 1995 and newer needing orange OAT coolant
• Free of amines, phosphate, borate, nitrite and silicate to avoid additive conflicts
• Contains Denatonium Benzoate to deter accidental ingestion

How does it protect the engine and cooling system metals?

This formula forms a protective film on metal surfaces to reduce corrosion, scale and electrochemical wear across the system. It’s especially tuned to safeguard aluminum components commonly used in modern radiators and cylinder heads.

• Inhibits rust and corrosion on aluminum, iron and other metals
• Helps maintain heat transfer efficiency by reducing scale formation
• Promotes stable pH and inhibitor concentration over long service intervals

What maintenance interval can I expect after a full flush and fill?

When you perform a complete cooling system flush and fill, PEAK DEX-Cool® is formulated to provide up to 10 years or 150,000 miles of protection under normal operating conditions. Regular coolant checks and system inspections remain important to confirm performance and detect leaks or contamination early.

• Service life: up to 10 years / 150,000 miles after full flush and fill
• Use with a correctly flushed system to avoid mixing with incompatible coolants
• Periodic visual checks and coolant testing recommended for fleet or severe-duty use

Can I mix this coolant with other colors or types?

This PEAK DEX-Cool® formula is specifically an OAT (orange) coolant and should not be mixed with coolants that use different inhibitor chemistries (like traditional IAT or some HOAT/SiOAT types). Mixing incompatible coolants can reduce corrosion protection and shorten expected life.

• Do not mix with IAT (green), some HOAT (yellow/blue) or other incompatible formulas
• If switching, complete a full system flush to remove residual coolant
• Refer to your vehicle owner’s manual for the OEM-recommended coolant type

Who is this for? PEAK DEX-Cool® Antifreeze + Coolant is tailored for owners and technicians of GM vehicles (1995 and newer) that require orange OAT coolant. It’s ideal for routine maintenance, long-term service intervals, and anyone who prefers a factory-compatible, phosphate- and silicate-free formula that prioritizes aluminum protection and industry-standard performance.