Shell ROTELLA 550019907 T5 10W40 Synthetic Blend Heavy Duty Engine Diesel Oil - 1 Gallon Jug Emission System Compatibility; Advanced low-ash formulation helps control the blocking or poisoning of exhaust after-treatment devices, helping maintain vehicle emissions compliance and engine fuel efficiency Fuel Economy Capability; The use of synthetic base oil components provides Shell Rotella T5 with the capability to improve cold starting and reduce fuel consumption and save money, without compromising engine protection or durability Improves Engine Cleanliness; The advanced formulation delivers good engine cleanliness and protection against piston deposits allowing Shell Rotella T5 to ensure engine and component reliability at extended oil drain intervals Low Emission engine use; Shell Rotella T5 meets the requirements of all major US and European engine manufacturers for low emission applications T5 Synthetic Blend Heavy Duty has a emission system compatibility; Advanced low-ash formulation helps control the blocking or poisoning of exhaust after-treatment devices, helping maintain vehicle emissions compliance and engine fuel efficiency