O&K (Orenstein & Koppel) was a German engineering company which specialised in heavy equipment. Some of their construction equipment has been fitted with a Mitsubishi engine; see the overview below to find out which engines have been used in which type of mini excavator.

  Type Engine brand Type
Mini excavator RH 1.17 Mitsubishi L3E-W262KL
Mini excavator RH 1.21 Mitsubishi L3E-W262KL
Mini excavator RH 1.29 Mitsubishi S4L-Y262KL
Mini excavator RH 1.35 Mitsubishi S4L2-Y263KL
Mini excavator H 1.48 Mitsubishi S4Q2-Y262KL