The Mercedes OM606 Turbodiesel

Among the diesel engines Mercedes-Benz produced in the 1990s, the OM606 occupies a particular position: the last and most sophisticated of the company's inline-six diesels before the V6 era, and the engine that diesel specialists have spent the decades since proving out far beyond its factory ratings. We have rebuilt this engine many times over, and it has earned its place as the most powerful Mercedes diesel we offer in the Geländewagen.

OM606 Engine Specs and Technical Details

The OM606 is a 3.0 liter (2,996 cc) inline-six-cylinder turbodiesel. Its defining departure from the engines that preceded it is the dual overhead camshaft valvetrain, with four valves per cylinder, an architecture more commonly associated with performance gasoline engines of the period and the source of the OM606's superior breathing and output.

Key specifications:

• Configuration: Inline-six-cylinder, DOHC, 24-valve
• Displacement: 2,996 cc
• Horsepower: Approximately 175 hp (stock)
• Torque: Approximately 243 lb-ft (stock)
• Fuel injection: Indirect injection with inline injection pump
• Construction: Cast-iron block, aluminum head

Models Featuring the OM606 Engine

Mercedes-Benz fitted the OM606 primarily in its European-market sedans through the 1990s:

• Mercedes-Benz W124 E-Class (E300 Diesel, 1993-1995): the engine's introduction, in the final years of a chassis already regarded as one of the company's most durable.
• Mercedes-Benz W210 E-Class (E300 Turbodiesel, 1996-1999): the turbocharged version that established the engine's modern reputation, pairing the DOHC six with forced induction.
• Mercedes-Benz W140 S-Class (S300 Turbodiesel): the engine's flagship application, where it moved the largest sedan Mercedes built with the smoothness the platform demanded.

The engine never left the sedan family in factory form. Its arrival in the G-Wagen is a development of the decades that followed, and one that suits both machines.

OM606 Reliability and Proven Performance

The OM606's standing among diesel specialists rests on the combination of its cast-iron bottom end and its capacity for power. The block, crankshaft, and connecting rods were engineered with the conservatism typical of Mercedes diesels of the era, which is why unmodified examples routinely reach mileages that would retire most engines. The same margins are what make the engine responsive to development: the fueling and boost can be raised substantially before the rotating assembly becomes the limit, a characteristic demonstrated over the years in applications from high-mileage daily sedans to purpose-built competition cars.

That headroom is the engineering fact at the center of the OM606's reputation, and it is the reason the engine responds so well to careful rebuilding. The power is not extracted from the engine; it was designed into it, and left unused.

The OM606 Mercedes Wolf

We offer the OM606, in our OM606a specification, as the most powerful of the three Mercedes diesel options in our restorations, alongside the original OM602 and the five-cylinder OM605a. It exists in our lineup for clients who want substantially more performance than the original engine provides while keeping the Wolf's drivetrain within the Mercedes diesel family it was born into.

Each OM606 we fit is rebuilt in-house as part of the restoration, with upgraded injection pumps and turbochargers, and tuned to approximately 275 horsepower and 350 lb-ft of torque, paired with the client's choice of a Mercedes 717 five-speed manual or a ZF 8HP eight-speed automatic. The tuning is developed for the way these trucks are actually driven: smooth delivery from low revs, composed highway cruising, and none of the smoke or harshness associated with older diesel installations. The result carries the character of a classic Mercedes convertible with a reserve of power the original never had.

Commission an OM606 250GD Turbo

To explore and design your EMC 250GD G-Wagen, head over to our custom G-Wagen configurator.

For more information on the iconic Mercedes G Class, visit our History of the G-Wagen page here.