Production of the W123 chassis ended in 1985 but in many countries as many as 75% of the cars originally registered remain on the road today 20 years later, a testament to the quality and durability of the original design. The 300D badge continued on in the W124 chassis family until 1993, but as a completely different design. The W123 is an ultra reliable automobile which routinely goes over 500,000 miles in its lifetime.
The W124 chassis 300D (pre E Class facelift) has the OM603 engine, which is a 3.0 litre six-cylinder turbocharged engine that appeared for one year only, 1987. The Turbo Diesel W124 appeared anew in 1990 until 1993, as the 300D 2.5 Turbo, with the OM602 engine. The latter engine was a 2.5 litre five cylinder turbocharged engine.