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Amsoil offers its Synthetic 5W-40 Premium Diesel Oil. This is a premium diesel oil for model year 2007 and newer heavy-duty and pick-up truck diesel engines requiring API CJ-4 emission quality oil standards. The new oil delivers extraordinary lubrication in diesel engines found in commercial, fleet and personal vehicles. Formulated with the latest additive technology and the most advanced synthetic base oils, Amsoil Synthetic 5W-40 Premium Diesel Oil exceeds the higher performance demands of modern engines. The product withstands the stress of heat, soot and acids to help prevent deposits, corrosion and wear, and its broad viscosity range offers superior protection over a wide temperature range. Amsoil Synthetic 5W-40 Premium Diesel Oil resists breakdown and is recommended for the longest service interval established by the engine, vehicle or equipment manufacturer. Drain intervals may be extended when monitored by oil analysis.