Shell Rimula RT4 contains selected additives that are designed to provide Triple Protection to improve engine and oil durability in 3 critical areas: Acid and Corrosion Control, Reduced Engine Wear and Deposit Control. It helps to lower maintenance and increase reliability of vehicles. It is suitable for most heavy-duty diesel engines, non-turbocharged and turbocharged alike, for on and off highway applications and has wide array of engine manufacturers' approvals.