Reco-Cool HD Premium-N 50% Pre-Diluted Antifreeze/Coolant is a ready-to-use, low-silicate, nitrited coolant designed for both automotive and heavy-duty diesel engines. It features hybrid organic acid technology and does not require supplemental coolant additives during the initial fill. Free from phosphates and amines, it is suitable for both petrol and diesel engines. This coolant is specifically formulated for applications that require a hybrid, nitrited, and low-silicate solution without amines or phosphates.