A method is provided for operating an oil supply for a combustion engine and / or a transmission system of a motor vehicle particularly with start / stop-automatic, comprises the steps, that a deceleration of the motor vehicle is detected, at least one status parameter, which correlates with the manner of the deceleration, is monitored, a future oil pressure of the oil supply is estimated based on the status parameter and the actual oil supply control strategy, and if the estimated future oil pressure is below a predetermined threshold of the oil pressure, an oil pump for filling an accumulator tank of the oil supply is activated. Since the accumulator tank is filled in advance of a possible automatic stop a sufficient high oil pressure, when the combustion engine is started again, is safeguarded, wherein the period of time for accomplishing the automatic stop is not lengthened. This leads to a reduction of the fuel consumption and the CO2-emissions of the combustion engine without dealing with a too low oil pressure at the start of the combustion engine.