PEAK Blue Si‑HOAT Antifreeze/Coolant Concentrate 1 Gal — Extended Life for European Vehicles

PEAK OET Extended Life Blue Concentrate is a silicate-enhanced HOAT antifreeze/coolant formulated for European vehicles to help prevent corrosion and extend service intervals up to 150,000 miles or 5 years when installed as a complete flush and fill.

Built for modern cooling systems that need a blue Si-HOAT formula, this 1‑gallon concentrate from PEAK is designed to mix to the proper strength for flushing, filling, or topping off European cars and light trucks. The formulation contains a bittering agent (Denatonium Benzoate) and corrosion inhibitors that protect aluminum heads, radiators, water pumps, and heater cores. Because it is a concentrate, you’ll dilute it according to your vehicle’s specifications so you get the correct freeze/boil protection and inhibitor levels.

What makes this coolant suitable for European vehicles?

The PEAK OET Extended Life Blue Concentrate is a silicate-enhanced hybrid organic acid technology (Si‑HOAT) formula tailored for brands that specify blue coolant chemistry. It includes inhibitors that address the mixed-metal environments common in European engines and cooling systems. It’s recommended for use with BMW, Jaguar, Volvo, and other marques calling for this type of antifreeze/coolant.

• Si‑HOAT formulation compatible with European OEM requirements
• Engineered to protect aluminum and mixed-metal components
• Recommended for specific European makes like BMW and Jaguar
• Contains bittering agent to deter accidental ingestion

How does PEAK OET protect the cooling system?

This concentrate contains corrosion inhibitors and silicates that form protective films on metal surfaces to reduce rust and erosion. Proper use—installed as part of a full flush and fill—helps maintain inhibitor levels and can extend the interval between coolant services. It also helps keep radiators and heater cores free from damaging deposits when used with good maintenance practices.

• Prevents rust and corrosion on cooling system components
• Silicates protect aluminum while organic acids guard mixed metals
• Helps prevent scale and deposit buildup when used correctly
• Works well during both flushing and topping-off operations

How do I use the concentrated formula safely and effectively?

The product is a concentrate intended to be mixed with water to achieve the correct freeze and boil protection for your climate and vehicle. Always follow the vehicle manufacturer’s dilution recommendations and the product labeling when mixing. If you’re performing a service, a complete flush and refill ensures maximum performance and the manufacturer’s stated protection interval.

• Mix concentrate with distilled or clean water per vehicle specs
• Perform a complete flush and refill for best inhibitor performance
• Use correct concentration for desired freeze/boil protection
• Dispose of old coolant responsibly at a recycling center

What service life and compatibility can I expect?

When installed as part of a full flush and fill, PEAK guarantees a service life protection up to 150,000 miles or 5 years per the label instructions. The concentrate is formulated to be compatible with other extended life antifreeze/coolants, but mixing different chemistries should be avoided unless specifically permitted. For topping off, match the chemistry to what’s already in the system or perform a flush to switch chemistries cleanly.

• Guaranteed up to 150,000 miles or 5 years with full flush/fill
• Compatible with other extended life coolants of the same chemistry
• Avoid mixing incompatible coolant chemistries without a flush
• Includes Denatonium Benzoate to discourage ingestion

Who is this for: PEAK OET Extended Life Blue Concentrate is aimed at owners and technicians who maintain European cars and light trucks that require a blue Si‑HOAT antifreeze/coolant. It’s especially useful for service bays, independent shops, and DIYers who perform flush-and-fill services and need a concentrated product to tailor freeze/boil protection to regional climates while protecting mixed-metal cooling systems.