A method for operating an internal combustion engine that is supplied with lubricating oil via an oil circuit. A measurement value of the total base number and/or a measurement value of the oxidation of lubricating oil currently used in the oil circuit for the lubrication is detected. Dependent on the established measurement value of the total base number and/or dependent on the established measurement value of the oxidation an exchange oil quantity for the oil circuit is determined. Currently used lubricating oil to an extent corresponding to the exchange oil quantity is removed from the oil circuit and new lubricating oil to an extent corresponding to the exchange oil quantity is supplied to the oil circuit.

A device is provided, which controls a vehicle-mounted engine provided with an engine body with a plurality of cylinders, a plurality of independent intake passages, each connected to the engine body so as to communicate with a combustion chamber of each cylinder via an intake port, and a surge tank connected to an upstream end of each independent intake passage. The device includes a phase changer, an ambient temperature sensor, and a controller configured to acquire an amount of condensate water existing in the surge tank. When the engine is stopped in a situation where the ambient temperature is lower than a given reference temperature and the condensate water amount is above a given reference amount, the controller controls the phase changer so that a lift amount of an intake valve in each cylinder of the stopped engine becomes outside a given minute lift range.

A method for operating an internal combustion engine wherein the internal combustion engine to be operated is supplied with lubricating oil via an oil circuit. A measurement value of a total base number and/or a measurement value of the viscosity of the lubricating oil currently used in the oil circuit for the lubrication is detected. Dependent on the established measurement value of the total base number and/or dependent on the established measurement value of the viscosity an exchange oil quantity for the oil circuit is determined. Currently used lubricating oil to an extent corresponding to the exchange oil quantity is removed from the oil circuit. New lubricating oil to an extent corresponding to the exchange oil quantity is supplied to the oil circuit.

Systems are provided for a crankcase ventilation system. In one example, a crankcase ventilation (CCV) system for an engine configured to transmit crankcase gases into a clean side air duct, the clean side air duct comprising a sensor and a crankcase ventilation spigot, wherein the crankcase ventilation spigot is configured to be disposed downstream of the sensor, the crankcase ventilation spigot having an outlet configured to direct crankcase gases emerging from the crankcase ventilation spigot away from the sensor.

Methods and systems are provided for monitoring a crankcase ventilation system. In one example, a method may include diagnosing a breach in a crankcase vent tube based on a regression of measurements of pressure in the crankcase vent tube. The regression allows the pressure measurements to be extended across an entire range of operating air flows and the breach may be identified by comparing the regressed pressure measurements to expected crankcase vent tube pressures.

A method and a device for checking the functionality of a crankcase ventilation system of an internal combustion engine is provided. The system has a low-load vent line and a high-load vent line between a crankcase outlet of a crankcase and a respectively associated introduction point into an air path of the internal combustion engine, in which method and device the pressure prevailing in the crankcase is measured by a crankcase pressure sensor and is compared with a crankcase pressure modeled on the assumption of a fault-free crankcase ventilation system, and in which method and device information items regarding the presence of a fault and of an associated fault location in the crankcase ventilation system are determined from the comparison result.

A method for detecting engine oil replacement may include determining a measured oil temperature change amount based on an engine oil temperature measurement value during an engine turned-off period determined based on turning-off/on signals, determining a modeled oil temperature change amount based on a temperature change model estimating the engine oil temperature without an engine oil replacement event according to the engine turned-off period, temperature information related to the engine at an engine turned-off time point, and temperature information related to the engine at a turned-on time point, comparing a difference value between the measured oil temperature change amount and the modeled oil temperature change amount with a reference temperature, determining whether the engine oil replacement event has occurred during the engine turned-off period based on a comparison result, and resetting an engine oil replacement timing and displaying the reset engine oil replacement timing in a user interface.

An internal combustion engine in which component parts slide against each other during operation, the internal combustion engine including: a water supply device that supplies water to the sliding surfaces of the component parts; and a control device that controls an operation of the internal combustion engine. At least one of the sliding surfaces of the component parts is made of silicon-based ceramics. The control device controls the operation of the internal combustion engine such that a low load or a no-load operation in which an engine load is limited to a predetermined reference load or less is performed until a predetermined standby period elapses after the operation of the internal combustion engine is started, and controls the operation of the internal combustion engine such that a normal operation in which the engine load is not limited to the reference load or less is performed after the standby period elapses.

Systems are provided for a crankcase ventilation system. In one example, a crankcase ventilation (CCV) system for an engine configured to transmit crankcase gases into a clean side air duct, the clean side air duct comprising a sensor and a crankcase ventilation spigot, wherein the crankcase ventilation spigot is configured to be disposed downstream of the sensor, the crankcase ventilation spigot having an outlet configured to direct crankcase gases emerging from the crankcase ventilation spigot away from the sensor.

An oil change system. The oil change system includes a plurality of fluid systems and a control circuit. Each of the fluid systems is couplable to a quick fit valve of a vehicle. The control circuit is coupled to the plurality of fluid systems, comprises a processing circuit, and is configured to control delivery of a predetermined volume of a fluid to the quick fit valve of the vehicle.