ULTRA 7000 15W-40 is an extreme high performance diesel engine oil that provides excellent lubrication of diesel engines promoting increment in engine life. Advanced chemistry in this product provides outstanding fuel economy and performance in modern, low-emission diesel engines and older diesel engines that burn low- or high-sulfur fuel. It offers excellent control of oil thickening due to soot build-up, as well as great resistance to oxidation, corrosion, and high temperature deposits.