MANN+HUMMEL (Germany)
Donaldson (US)
Robert Bosch (Germany)
MAHLE (Germany)
Sogefi (Italy)
Denso (Japan)
Ahlstrom-Munksj? (Sweden)
ACDelco (US)
Hengst (Germany)
K&N Engineering (US)
Volkswagen (Germany)
Daimler AG (Germany)
Ford Motor Company (US)