The Mercedes-Benz OM366 is a straight-6 overhead valve (OHV) diesel engine with 2 valves per cylinder. It is related to the straight-4 OM364 engine which has two cylinders removed, while the bore and stroke remain unchanged.
It launched in 1983 and had a direct injection system (inline fuel pump) to deliver fuel to every cylinder. It used a twin-scroll turbocharger, giving approximately of boost.