T R P Extended Life Nitrite Free Coolant is a premium cooling system solution designed specifically for heavy-duty truck engines running on diesel, gasoline, or natural gas. This red-colored coolant offers extended service life up to 1,200,000 miles on Class-8 trucks without the need for supplemental coolant additives (SCA) extenders. The nitrite-free formulation delivers superior protection for aluminum components in modern engines while meeting OEM specifications. This 2-pack provides excellent value for fleet maintenance and ensures optimal engine cooling performance. The advanced organic additive technology helps maintain proper engine temperature and prevents corrosion in cooling systems. Perfect for commercial trucking applications where long-lasting, reliable coolant performance is essential. Each pack contains 1 gallon of coolant, making it convenient for maintenance scheduling and inventory management.