Reco-Cool HD Expert Extend 50% is a long-lasting engine coolant using organic additive technology (OAT), making it ideal for heavy-duty and diesel engines. It provides excellent corrosion protection, including wet sleeve liners, and prevents rust, cavitation, and high-temperature damage to aluminum components. Free from borates, nitrites, amines, phosphates, and silicates (BNAPS-free), it meets the chemical requirements of major heavy-duty OEMs worldwide. It is also fully compatible with other OAT-based coolants.