MAN engines for natural gas and special gases (biogas, landfill gas, sewage gas) guarantee security of supply. Extensively tested and optimized in field tests, they prove their reliability under the most adverse environmental conditions. The performance portfolio covers the entire range between 37 and 550 kW. That makes them the ideal energy supplier for the widest range of operations in cogeneration. The sophisticated and easily accessible construction enables maintenance work to be carried out promptly, efficiently, and at low cost. Further, low fuel consumption preserves resources and contributes actively to protection of the environment. To comply with the strict emissions directive, exhaust-gas after treatment is often not even needed. On special gas engines, such as for biogas operation, it is possible to dispense with the oxidation catalytic converter.