The Mercedes-Benz 300D was a flagship model of the W123 series that ran from 1976 to 1985. It represented the peak of what Mercedes-Benz can do when it comes to engineering, durability, and innovation. The car became famous for its robust 3.0-liter, five-cylinder OM617 diesel engine, which came in both turbocharged and naturally aspirated versions as well. This was one of many groundbreaking diesel technology upgrades that Mercedes-Benz introduced with this vehicle. In addition to enhancing power and performance by a significant amount, the Mercedes-Benz 300D also boasted a sophisticated front-engine, rear-wheel-drive layout across four different body styles, including a 4-door sedan, a 2-door coupe, a 5-door estate, and a 4-door limousine. There were multiple types of transmissions available for the 300D as well, ranging from a simple 4-speed manual transmission to a more advanced automatic option with up to five gears for those who wanted greater engagement on the road. On top of this already impressive design, there were many additional safety features, such as crumple zones and an optional anti-lock braking system (ABS), starting in August of 1980. Inside the cabin, you can find luxurious interiors featuring cloth or leather upholstery, depending on which option you went with at purchase time. All in all, the Mercedes-Benz 300D is known for its reliability and durability, which makes it perfect for collectors or anyone interested in vintage models from the company's earlier years.
The Mercedes-Benz 300D is a popular car that most people adore but there are weaknesses that have been experienced time and again. It's a 1987 model and the gears are stuck especially the third gear when trying to shift. This limits the acceleration of the vehicle and it rarely goes beyond 45 mph. This shaky problem commonly begins at 149000 miles, and nobody has any idea what is wrong between the engine and transmission. At 1982 installations the engine does not like being turned off or does jerky when you turn it off. This could mean parts in the engine are failing or the vacuum system is not working properly. It is at 155,000 miles when the 300D owners often begin to experience these problems. Also, with models from 1978 you will get a rough idle because the vacuum system, which is necessary for the proper operation of the engine and smoothness, has been worn out. At approximately 268,000 miles, the first occurrence of this specific issue is noted. It is evident from these examples that any car as old as this Mercedes-Benz 300D can encounter so many problems and this is why it is crucial to have regular check-ups in order to ensure that the car is in its tip-top shape.
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