STP® Premixed Heavy Duty Antifreeze/Coolant offers an advanced cooling solution for a broad range of vehicles. This 50/50 premixed formula is specially designed for high-performance demands across automotive, light duty, and heavy-duty diesel applications, including on-road trucks, off-road, and farm equipment. Crafted with a low silicate and phosphate-free blend, it effectively protects against corrosion without the need for an initial charge of Supplemental Coolant Additives (SCA), making it ideal for multi-vehicle fleets. This aluminum-compatible coolant meets stringent industry standards, ensuring optimal engine performance and longevity.