GEO SAE 30 Ashless Engine Oil is based on an exclusive ashless formulation to help prevent combustion chamber deposits, exhaust port blockage and spark plug fouling in naturally aspirated and turbocharged 2- and 4-stroke engines operating on a variety of fuels: CNG (compressed natural gas), LPG (liquefied petroleum gas) and LNG (liquefied natural gas). The ashless formulation reduces spark plug fouling, port plugging and pre-ignition. Also effectively minimizes formation of crankcase deposits and valve cover / top deck sludge. Catalyst compatible formulation.