Description Rotella T Triple Protection, Shell Rotella T4 Triple Protection Heavy Duty Diesel Engine Oil is the most technically advanced Shell Rotella formulation ever. This 15W-40 motor oil uses advanced additive technology to protect under the most severe engine conditions found in modern, low-emission engines and older hard-working diesel engines. It effectively sustains emissions control system durability where diesel particulate filters and after-treatment systems are used. Plus, it provides enhanced protection against viscosity loss due to shear and improved oil aeration compared to the previous formulation.PRODUCT DETAILS:Acid control helps protect against corrosion from acids formed as fuel burns and the oil ages. Deposit control helps keep engines clean for optimum performance and long life. Wear control helps keep moving metal engine surfaces apart for a longer life.