Shell Rotella 550045144 T4 10W-30 Triple Protection Motor Oil is heavy-duty diesel engine oil that has been formulated to provide Triple Protection against wear, deposits and oil breakdown. Advanced engine oil additive technology protects under the most severe engine conditions found in modern low emission engines. The SAE 30 motor oil has an exclusive low-ash formulation that helps protect the exhaust catalysts and particulate filters found on the latest low emission vehicles. 3 Gallons/Case