Shell Rotella T3 NG 15W 40 Heavy Duty Engine Oil 55 Gallon Drum btpcat_other_354271819 reduces time wasted on calls reduces time wasted on calls to numerous suppliers Perfect for every cleaning job with just the right dilution Good piston and engine cleanliness Optimized balance of detergency and dispersancy provides good piston and engine cleanliness ensuring long and efficient engine operation Shell Rotella T3 NG 15W 40 Energized Protection oil uses tailored combinations of high performance additives to ensure that the oil adapts and protects under the range of pressures and temperatures found in compressed natural gas (CNG) fueled engines