Shell unveiled Rotella T4 NG Plus 15W-40, a heavy-duty engine oil, formulated to provide engine protection under a full range of pressures and temperatures in mobile natural gas engines, as well as gasoline and diesel fueled vehicles. According to the company, the oil offers piston and engine cleanliness, ignition system protection and emissions system compatibility. Shell Rotella T6 Full Synthetic SAE 0W-40 heavy-duty diesel engine oil also made its debut. The product meets API CK-4 specifications and is designed for use in on- and off-road vehicles and equipment. Web: rotella.shell.com