A tank stores a coolant liquid and an engine and/or transmission lubricant for a motor vehicle heat engine, as well as a circuit for the cooling and heat regulation of that engine.;The tank has a thermally insulating outer wall including an inlet and an outlet for this liquid, and inside the wall, it comprises heating means that are able to preheat this liquid for the cold engine start of the vehicle.;The tank further includes a first compartment for this liquid that is provided with said inlet and said outlet, and at least one other compartment that is appropriate for storing an engine or transmission lubricant and that is separated from the first compartment by a tight partition in a lower zone of the first compartment, these compartments each containing at least one local heating means as heating means.
