Since 1952, Heinz Hartmann GmbH has been a contractual partner for Mercedes-Benz utility vehicles. In the course of decades full of tradition, the once small workshop in Holzheim became one of the largest utility vehicle service centres in North Rhine-Westphalia. Each day, over 50 employees oversee the servicing and repairs of Mercedes-Benz trucks and vans. In 2003, Hartmann GmbH launched tuning series for the Sprinter. Various series followed for the Vito and Viano.