PEAK Extended-Life Antifreeze/Coolant Concentrate for Heavy-Duty Engines, 1 Gal — EGR/SCR Safe

PEAK FINAL CHARGE is a concentrated, extended-life antifreeze/coolant designed for heavy-duty diesel, gasoline, and natural gas engine cooling systems.

This one-gallon concentrate from PEAK mixes with water to create a high-performance coolant that helps manage engine temperatures, protect metal components from corrosion, and extend service intervals in heavy-duty applications. Formulated for modern engines with exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) systems, it provides reliable heat transfer while minimizing wear on water pump seals. The formula also contains Denatonium Benzoate (a bittering agent) to discourage accidental ingestion and has compatibility with other coolants if contamination remains low.

How does this concentrate help engines with EGR and SCR systems?

PEAK FINAL CHARGE is engineered for the thermal demands of engines fitted with emission control hardware. Its heat-transfer properties maintain stable operating temperatures under high loads, reducing the risk of overheating and thermal stress to critical components. The formulation avoids aggressive additives that can accelerate deposit formation in EGR and SCR pathways.

• Optimized heat transfer for high-temperature engine operation
• Compatibility with emission-system materials to reduce deposits
• Concentrated form lets you mix to required freeze/boil protection

Can I mix this coolant with other brands or types?

PEAK FINAL CHARGE can be blended with other coolants, but doing so may affect performance. To preserve corrosion protection and formulation integrity, contamination should be kept below 25%. When topping off or switching, follow recommended dilution and monitor coolant condition regularly.

• Mixing allowed if contamination remains under 25%
• Use proper dilution to achieve intended freeze/boil protection
• Inspect system for cross-contamination before blending

What maintenance life and protection levels can I expect?

When mixed and maintained correctly, the antifreeze/coolant mixture is designed to support extended service intervals and long-term protection. PEAK specifies that, under proper maintenance practices, a correctly prepared mixture can protect engines for up to one million miles of on-road use. Regular checks of concentration, pH, and contamination help ensure that service life is maximized.

• Formulated for long service intervals when maintained
• Supports corrosion resistance for multiple engine metals
• Check concentration and condition periodically to maintain performance

Will this product affect water pump seals and components?

The non-abrasive chemistry in PEAK FINAL CHARGE is designed to be gentle on seals and cooling system components. It can help prolong water pump seal life compared with more abrasive formulations, while still delivering the corrosion control and thermal stability required in heavy-duty engines.

• Non-abrasive formula to reduce seal wear
• Corrosion inhibitors protect radiators and engine passages
• Contains a bittering agent to discourage ingestion

Who is this for: PEAK FINAL CHARGE concentrate is intended for fleet managers, heavy-equipment operators, and technicians who service heavy-duty diesel, gasoline, or natural gas engines. It’s suitable for shops that need flexible dilution options, long service intervals, and a coolant compatible with modern emission-related engine hardware. Not recommended for closed systems specifying a different coolant technology without consulting the engine manufacturer.