United Railroad Engine Oil is formulated to provide year-round lubrication in two- and four-cycle, low- and high-horsepower, turbocharged, railroad, marine and stationary medium-speed diesel engines requiring zinc-free lubrication. United’s optimized additive formulation has a reduced ash content and incorporates advanced dispersant technology. It is engineered to reduce oxidation and provide thermal stability along with improved yellow metal wear protection. United Railroad Engine Oil is formulated to provide lower oil consumption, lower deposits and longer filter life.