Rotella T4 Triple Protection Diesel Engine Oil 10W-30, 1 Gallon - Pack of 1 ROTELLA T4 10W-30 diesel oil provides Triple Protection against wear, deposits and oil breakdown for most heavy-duty engines Formulated with advanced additive technology for enhanced deposit protection to help keep engines cleaner over the oil drain interval Provides increased shear stability for better viscosity control and optimal engine oil pressure compared to the previous formulation ROTELLA 10W-30 helps protect exhaust catalysts and particulate filters to maintain emission compliance and fuel efficiency Protects your bottom line with a lower viscosity that allows for less engine resistance for improved fuel economy (compared to 15W-40)