Audi AG Ingolstadt, Germany

BMW Germany

Bosch GmbH, Germany

Caterpillar, USA

Citroen, France

Cummins Engine Company Inc., USA

DaimlerChrysler AG Stuttgart, Germany

Fiat Auto, Italy

Ford Motor Company Ltd., USA

General Motors Inc., USA

Mack Trucks, USA

MAN Nutzfahrzeuge AG, Germany

Adam Opel AG, Rüsselsheim, Germany

Perkins Engines Company Ltd., United Kingdom

PSA Peugeot, France

Porsche AG, Germany

Renault, France

Vauxhall Motors Limited, United Kingdom

J.M. Voith AG, Heidenheim, Germany

Volkswagen AG, Germany

ZF Friedrichshafen AG, Germany