Diesel Treat 2000 Ultra Low Sulfur is an ashless, all-season fuel additive formulated for use with all types of diesel fuel, especially low sulfur and ultra low sulfur diesel fuels. Schaeffer's Diesel Treat 2000 contains a highly concentrated, multi-functional additive package blended with our patented SynShield formula. This unique formula disperses existing injector clogging and plugging, and provides super keep clean performance throughout the entire system. SynShield surpasses industry standards for fuel lubricity and emissions and provides extra protection against fuel system wear and injector scoring. Schaeffer's Diesel Treat 2000 Ultra Low Sulfur meets DW10 specifications.