Abstract: An exemplary fluid heating method includes, among other things, operating an engine of a vehicle to heat an engine fluid during a drive cycle if the vehicle is in a fluid maintenance mode, and heating the fluid prior to the drive cycle if the vehicle is in the fluid maintenance mode and the vehicle is electrically coupled to a grid power source. An exemplary fluid heating assembly includes, among other things, an engine of an electrified vehicle, and a fluid heater that is activated to heat a fluid of the engine in response to the electrified vehicle being in a fluid maintenance mode when electrically coupled to a grid power source.

Abstract: An exemplary monitoring assembly includes a sensor that provides a first output when a lubricant reservoir holds a first amount of a contaminant, and a different, second output when the lubricant reservoir holds a different, second amount of the contaminant. A lubrication system monitoring controller operatively coupled to the sensor and configured to initiate a maintenance mode in response to the second output.

Abstract: An exemplary fluid heating method includes, among other things, operating an engine of a vehicle to heat an engine fluid during a drive cycle if the vehicle is in a fluid maintenance mode, and heating the fluid prior to the drive cycle if the vehicle is in the fluid maintenance mode and the vehicle is electrically coupled to a grid power source. An exemplary fluid heating assembly includes, among other things, an engine of an electrified vehicle, and a fluid heater that is activated to heat a fluid of the engine in response to the electrified vehicle being in a fluid maintenance mode when electrically coupled to a grid power source.

Abstract: An exemplary monitoring assembly includes a sensor that provides a first output when a lubricant reservoir holds a first amount of a contaminant, and a different, second output when the lubricant reservoir holds a different, second amount of the contaminant. A lubrication system monitoring controller operatively coupled to the sensor and configured to initiate a maintenance mode in response to the second output.

Abstract: A method comprises on board a hybrid vehicle and executed by a vehicle controller on board the hybrid vehicle, determining a pH based on a pH sensor positioned in a fuel system; and in response to a first condition comprising the pH being less than a first threshold pH, disabling an electric motor and propelling the hybrid vehicle with an engine. In this way, a risk of engine degradation due to fuel degradation can be reduced.

Abstract: A method comprises on board a hybrid vehicle and executed by a vehicle controller on board the hybrid vehicle, determining a pH based on a pH sensor positioned in a fuel system; and in response to a first condition comprising the pH being less than a first threshold pH, disabling an electric motor and propelling the hybrid vehicle with an engine. In this way, a risk of engine degradation due to fuel degradation can be reduced.