4x4s.org MERCEDES-BENZ · ENGINE

Mercedes-Benz engines

Mercedes-Benz OM621

The 2.2-litre diesel four of the Unimog 421.

Layout
inline-4
Capacity
2.2 litres
Fuel
diesel
Induction
naturally aspirated
Cooling
water
Built
1958–1968
Maker
Mercedes-Benz (Daimler-Benz)

In the registry

1 Mercedes-Benz vehicle is recorded with this engine.

Sources

  • Unimog — Wikipedia, accessed 2026-09-23