Miniature of a Head Gasket for Mercedes OM604

MB OM604 Keychain

The Mercedes-Benz OM604 is a four-cylinder diesel introduced in the early 1990s as part of a new generation of engines. Used in the C-Class (W202), E-Class (W124/W210), and more, it featured modern elements like four-valve heads and electronically assisted injection pumps. Our keychain recreates the outline of its head gasket in precise miniature—at first glance subtle, at second glance an unmistakable nod for Mercedes enthusiasts.

Built on a cast-iron block with an alloy head and DOHC valve train, the OM604 was offered in 2.0- and 2.2-liter versions. The 200D produced about 75 hp, ideal for long-distance economy, while the 220D delivered 95 hp and more flexibility. Both shared the hallmark Mercedes durability, with engines often surpassing 500,000 km when maintained properly.

Common enthusiast discussions revolve around the electronically controlled injection pump (ELR), glow plug servicing, head-gasket issues under thermal stress, and cold-start behavior. Still, the OM604 remains respected as a rugged workhorse with simple mechanics, especially compared to later CDI engines. Many see it as the last “true” Mercedes four-cylinder diesel before high-pressure common-rail complexity arrived.

This keychain is more than just an accessory—it’s a small piece of Mercedes heritage. A great gift for classic C- and E-Class drivers, but just as much something to keep for yourself if you own or admire the OM604. At first glance refined, at second glance a discreet signal to insiders, guaranteed to start conversations at meets, in the workshop, or at any diesel enthusiast gathering.

Proudly crafted in Germany, meticulously detailed and finely finished for a refined in-hand feel paired with a premium brushed surface.