A method and apparatus - for carrying out the method of mitigating fuel in oil in an internal combustion engine of a hybrid electric vehicle, the method comprising: detecting a temperature of engine oil in the engine ; determining when the temperature of the engine oil is below an engine oil temperature threshold ; and when the temperature of the engine oil is determined to be below the engine oil temperature threshold, inhibiting an engine stop unless the vehicle speed is below a first threshold vehicle speed or braking of the vehicle is effected at a vehicle speed below a second threshold vehicle speed
