Mobil Delvac CNG/LNG 15W-40 commercial vehicle lube is an excellent choice for spark-ignited Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG) fueled bus and truck engines. This high-performance, heavy-duty engine oil meets or exceeds the requirements of Cummins CES 20085 and Isuzu CNG Engine Oil. Mobil Delvac CNG/LNG 15W-40 works well with Exhaust Gas Recirculation (EGR) systems, three-way catalysts and other emissions reduction systems. Using Mobil Delvac CNG/LNG 15W-40 in your bus or truck ensures improved engine cleanliness, durability and longevity. It provides outstanding wear protection, thermal and shear stability, plus oxidation and nitration control. Mobil Delvac CNG/LNG 15W-40 has extended drain interval capability, and it will also help prevent spark plug fouling and excessive valve recession.