Shell Rotella 550019919 T Triple Protection 15W-40 Heavy Duty Diesel Engine Oil (CJ-4) - 2.5 Gal. Shell Rotella T Triple Protection oils provide triple action to help control wear, deposits and emissions to continuously adapt to the needs of your engine for protection in on and off highway applications Up to 38 percent lower wear in over 40 million miles of on and off road testing in late-model engines Meets or exceeds API CJ-4 requirements, and is designed to provide extra performance; Shell Rotella T Triple Protection performs well in both older and new engines 30 percent increase in active ash less chemistry to protect against deposits and sludge Using modern multi-component chemistry, Shell Rotella T Triple Protection gives all-around protection for turbo and non-turbocharged engines alike Shell Rotella T Triple Protection Heavy Duty oils provide triple action to help control wear, deposits and emissions to continuously adapt to the needs of your engine for protection in on and off highway applications