The Mercedes-Benz OM605 is a 2.5 L (2,497 cc) inline-five cylinder (R5/I5) double overhead camshaft (DOHC) diesel engine with indirect injection manufactured by Mercedes-Benz between 1993 and 2001.

It replaced the single overhead camshaft (SOHC) OM602 engine.

The head is a DOHC design with 4 valves x cylinder and split intake ports.

As per the OM602 it has hydraulic bucket type lifters, thus requiring no periodical valve adjustment.

A big difference when compared to its turbo predecessors is the intercooler It has a double row timing chain that drives the injection pump and the camshafts, the sprocket is on the exhaust camshaft and both cams are connected by a gear drive, while the oil pump is driven by a separate single row chain The main differences between the naturally aspirated and the turbocharged versions are the cylinder head, injection pump, valves, camshafts, rods, intake and exhaust manifolds and some minor differences like oil feed and return holes for the turbo and different crankcase ventilation system, valve cover and plastic engine cover