A method for operating a combustion engine having a crankcase, a piston group and a crankshaft, wherein the crankcase has an oil reservoir and an operational amount of lubricating oil is provided, wherein i) a partial amount of the lubricating oil is continuously discharged from the crankshaft and ii) a refill amount of new lubricating oil is continuously supplied, so that the operational amount of lubricating oil remains essentially the same; as well as a combustion engine for carrying out the method.

A system. The system includes a power source, a control module of a machine, and a fluid component. The fluid component is configured to establish an electrical connection between the power source and the control module during performance of a fluid operation on the machine when the machine is powered down.

Various embodiments of fluid monitoring systems are provided for use in connection with the fluid systems of machines such as engine-powered machines. The fluid monitoring systems may be configured for collecting and processing data associated with fluid refill operations, fluid evacuation operations, fluid purge operations, and other types of fluid operations in connection with different fluid components.

An aircraft engine, has: an oil system, a component containing a baseline volume of oil during normal operation greater than a maximum volume of the oil for compliance with fire resistance requirements, the oil system having: an oil circuit, a de-priming port fluidly connected to a fluid source at a pressure sufficient to overcome a pressure drop through the component to drain the component to a volume of oil less than the maximum volume of the oil for compliance with the fire resistance requirements, and a valve connected to the de-priming port, the valve having a closed configuration preventing the fluid from entering the oil circuit and an open configuration permitting the fluid to enter the oil circuit via the de-priming port and through the valve, the valve movable from the closed configuration to the open configuration in response to the component being subjected to a fire event.

Various embodiments of fluid monitoring systems are provided for use in connection with the fluid systems of machines such as engine-powered machines. The fluid monitoring systems may be configured for collecting and processing data associated with fluid refill operations, fluid evacuation operations, fluid purge operations, and other types of fluid operations in connection with different fluid components.

A system. The system includes a power source, a control module of a machine, and a fluid component. The fluid component is configured to establish an electrical connection between the power source and the control module during performance of a fluid operation on the machine when the machine is powered down.

An aircraft engine, has: an oil system, a component containing a baseline volume of oil during normal operation greater than a maximum volume of the oil for compliance with fire resistance requirements, the oil system having: an oil circuit, a de-priming port fluidly connected to a fluid source at a pressure sufficient to overcome a pressure drop through the component to drain the component to a volume of oil less than the maximum volume of the oil for compliance with the fire resistance requirements, and a valve connected to the de-priming port, the valve having a closed configuration preventing the fluid from entering the oil circuit and an open configuration permitting the fluid to enter the oil circuit via the de-priming port and through the valve, the valve movable from the closed configuration to the open configuration in response to the component being subjected to a fire event.

A system. The system includes a power source, a control module of a machine, and a fluid component. The fluid component is configured to establish an electrical connection between the power source and the control module during performance of a fluid operation on the machine when the machine is powered down.

A system. The system includes a power source, a control module of a machine, and a fluid component. The fluid component is configured to establish an electrical connection between the power source and the control module during performance of a fluid operation on the machine when the machine is powered down.