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A traditional coolant ideally suited for older vehicles this HD expert classic antifreeze/coolant is a fully formulated engine coolant based on an exclusive formulation of corrosion inhibitors. It is a low silicate; phosphate and amine free; aluminum compatible coolant that you can use in automotive, light duty, heavy duty diesel and natural gas engine vehicles such as on-road truck, off-road and farm equipment. Experts recommend this product for use where a fully formulated heavy duty diesel coolant is required.