The engine has cylinder groups downstream to high pressure turbines (15, 16) of high pressure stages of an exhaust gas turbocharger. The turbines (15, 16) are downstream to a low pressure turbine (21) of the turbocharger. The high pressure stages are assigned to bypass lines in such a way that the turbine (21) completely supplies an exhaust gas flow over the turbines (15, 16) in the partial loading operation with the closed lines.
