Mobil 1 Turbo Diesel Truck 5W-40 is a fully synthetic, high-performance, heavy-duty diesel engine oil specially formulated for a wide range of applications, from turbo diesel pick-up trucks and on-road transportation to off-road industries such as construction, mining and agriculture. Mobil 1 Turbo Diesel Truck 5W-40 helps maintain superior performance in elevated temperatures and severe stress conditions, whether for modern low-emission engines or well-maintained older vehicles, and even refrigerated units. Engineered for low volatility, excellent thermal stability and resistance to corrosion, Mobil 1 Turbo Diesel Truck 5W-40 is recommended for virtually all diesel-powered equipment from American, European and Japanese manufacturers, and is fully compatible with conventional oils. This oil also meets the API SM specification for gasoline engines used in mixed fleets.