An internal combustion engine with at least one combustion chamber, an intake system and optionally at least one prechamber for the at least one combustion chamber. The intake system includes a liquid fuel supply configured to provide a liquid fuel, at least one air-fuel-mixing-zone configured to mix air with liquid fuel from the liquid fuel supply and to provide an air-fuel-mixture, a combustion chamber intake manifold leading into the at least one combustion chamber, and optionally a prechamber intake manifold leading into the at least one prechamber. The internal combustion engine further includes at least one preheater configured to preheat the liquid fuel prior to its evaporation.