Torco TD-1 Super Diesel Motor Oil 15W-40 is designed for long drain intervals in engines using high sulfur fuels. It meets warranty requirements of American, Japanese and European diesel engine manufacturers. With high alkaline reserve (9-TBN) and corrosion inhibitors, TD-1 protects bearings against acids formed during combustion of high sulfur fuels. TD-1 is a blend of highly refined hydrocracked base oils and the most advanced detergents and dispersants plus Torco's MPZ® friction and wear reducing additive. Low sulfated ash and superior anti-wear properties contribute to longer engine life, fewer oil changes and less waste oil.