The Mercedes-Benz OM606 is a 3.0 litres (2,996 cc) inline-six cylinder (R6/I6) double overhead camshaft (DOHC) diesel engine with indirect injection manufactured by Mercedes-Benz between 1993 and 2001. It replaced the single overhead camshaft (SOHC) OM603 engine.

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Mercedes-Benz OM606 engine
Overview
Manufacturer	Mercedes-Benz
Production	1993–2001
Layout
Configuration	Straight-6
Displacement	3.0 L (2,996 cc)
Cylinder bore	87 mm (3.43 in)
Piston stroke	84 mm (3.31 in)
Cylinder block material	Cast iron
Cylinder head material	Aluminum
Valvetrain	DOHC 4 valves x cyl.
Compression ratio	22.0:1 (Turbo) 25.0:1 (N/A)
Combustion
Turbocharger	No (.91x), Yes, intercooled (.96x)
Fuel system	Indirect injection
Management	Bosch
Fuel type	Diesel
Oil system	Wet sump
Cooling system	Water cooled
Output
Power output	100–130 kW (136–177 PS; 134–174 hp)
Torque output	210–330 N⋅m (155–243 lb⋅ft)
Dimensions
Dry weight	210 kg (463 lb)
Chronology
Predecessor	Mercedes-Benz OM603 engine
Successor	Mercedes-Benz OM613 engine

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It uses a Bosch electronically controlled inline injection pump (ERE) except in the W124 where it uses a Bosch mechanically governed inline injection pump (Bosch M pump with RSF governor).

It is related to the straight-4 2.0 and 2.2 litre OM604 and the straight-5 2.5 litre OM605 engine families of the same era.

As per the OM603 the engine has a cast iron block and aluminum cylinder head, the block has 7 main caps, they are held by two bolts per cap. The head is a DOHC design with 4 valves per cylinder and split intake ports. As per the OM603 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. Only the .962 engine installed on the W210 E300 TURBODIESEL had a MAF sensor.

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.

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