Abstract: A procedure to operate an internal combustion engine, whereby at least one fuel afterinjection is conducted, and a device to implement the procedure are proposed. An oil dilution signal is ascertained as a measurement for, for example, the volume of the oil dilution brought into the motor oil of the internal combustion engine by at least one fuel afterinjection. The fuel afterinjection, which is at least one in number, is, for example, so designed to introduce non-combusted fuel as combustible fuel into the exhaust gas area of the internal combustion engine, which reacts exothermally in the exhaust gas area to heat the exhaust gas treatment device.

Abstract: A method for operating a particulate filter disposed in an exhaust-gas region of an internal combustion engine and a device for implementing the method. Based on an oil signal provided by an oil sensor, an oil-consumption determination determines the oil consumption of the internal combustion engine. From the oil signal, an ash-load determination calculates a measure for the ash-load state of the particulate filter, which can be taken into account for the operation of the particulate filter, particularly in establishing a threshold value for the maximum permissible particulate-load state. Moreover, a filter replacement signal can be obtained from the ash-load state.