ExxonMobil's Mobil Delvac 1 ESP 5W-40 is a synthetic diesel engine oil that promotes long drain capability and extends engine life. It is designed for both newer and older engine designs, including those with emission control systems, and performs at extreme temperatures as low as -31 degrees F. The 1 ESP 5W-40 also works for diesel engines with turbocharger, direct-injection, and low-emission designs, as well as on- and off-highway applications, including refrigeration units. Featuring a low-ash formulation and setp out wear protection, the oil offers oxidation stability and corrosion resistance.