Upon first tests by Jochen Mass, problems with the cooling were encountered and Coppuck had to redesign the radiator installation for more effective airflow. After the changes were made, Mass resumed testing the car, and the M26 made its debut at the Dutch Grand Prix that year in his hands. After the first race was completed with the car, it was decided amongst the team that the car needed further design work done, especially to the nose section and the M26 was not used again during 1976.