For those in the know, mentioning a 1987 Mercedes 300d sparks a certain level of appreciation. It’s a car that stands out, not just for its age, but for what it represents: a blend of robust engineering and understated style. While opinions may vary, for many enthusiasts, the ’87 300D offers a driving experience that’s genuinely rewarding, setting it apart from its contemporaries and even some modern vehicles.
The Enduring Appeal of the 1987 Mercedes 300D
What makes the 1987 Mercedes 300D so special? Firstly, it’s a step up in performance and handling compared to older Mercedes diesels, particularly those from the W123 series with their OM617 engines. The ’87 300D, part of the W124 family and powered by the OM603 engine, boasts improved fuel efficiency and a more aerodynamic design. Owners often report around 25 MPG in city driving and an impressive 30 MPG on the highway, figures that remain respectable even by today’s standards. Its design language was so influential that it was widely imitated, and remarkably, the W124 still manages to look contemporary decades later. Mercedes introduced the W124 chassis with gasoline engines in Germany in 1985, bringing them to the US in 1986, but it was the 1987 model year that saw the introduction of the OM603 diesel engine, marking a significant point in Mercedes diesel evolution.
Under the Hood: The OM603 Engine – Considerations for the 1987 300D Owner
The heart of the 1987 300D, the OM603 engine, is a topic that requires careful consideration. This engine generation was the first “modern” Mercedes diesel, featuring an alloy head, a departure from the iron heads of previous engines. While the alloy head offered performance benefits, it also came with a caveat: increased susceptibility to cracking if the engine overheats. Mercedes addressed this issue with improvements to both the cylinder head and head gasket in later iterations of the OM603. These later versions, identified by part numbers ending in “17”, “20”, and finally “22,” were more robust compared to the original “14” head. While a #14 head shouldn’t necessarily be a deal-breaker, it’s wise to be aware of this and potentially use it as a point of negotiation. Regardless of the head version, vigilant monitoring of the coolant temperature gauge is crucial. Avoiding overheating is paramount to prevent potential head issues in these early OM603 engines.
The reason behind Mercedes discontinuing the OM603 after 1987 remains somewhat unclear. Speculation points towards either the head problems or increasingly stringent emissions regulations at the time. Interestingly, Mercedes later introduced a 5-cylinder turbodiesel, the OM602, around 1990, and the final W124 models in 1995 featured the OM606 6-cylinder naturally aspirated engine. It’s also worth noting that as the W124 series progressed, it incorporated more and more electronic systems. This makes the earlier models, like the 1987 300D, simpler and potentially easier to maintain for those who prefer a less complex vehicle.
Potential Ownership Pitfalls: What to Inspect on a 1987 300D
Prospective buyers of a 1987 Mercedes 300D should be aware of potential expensive repairs. Key areas of concern include:
- Cylinder Head and Head Gasket: As mentioned, cracked heads or blown head gaskets can be costly to repair.
- Suspension: Suspension issues can be easily overlooked during a cursory inspection but can lead to significant expenses.
- Climate Control: Non-functional climate control systems are common in older cars, and repairs can be pricey, often going beyond a simple recharge.
- Sunroof: The W124 pioneered the slide/tilt sunroof, but early designs had some inherent problems that can result in costly repairs.
- Cruise Control: While less expensive than the above, cruise control failure is another common issue.
These potential issues underscore the importance of a thorough pre-purchase inspection by a qualified mechanic familiar with Mercedes-Benz vehicles.
DIY Maintenance and Cost Savings on a 1987 300D
Owning a 1987 Mercedes 300D doesn’t have to break the bank, especially for those willing to get their hands dirty. Many maintenance tasks are within the reach of the home mechanic. You can tackle jobs like:
- Oil and filter changes
- Fuel filter replacement
- Glow plug replacement
- Replacing light bulbs
- Basic wiring repairs
- Some suspension components
- Certain climate control system parts
Sourcing parts from reputable suppliers and performing DIY maintenance can significantly reduce running costs. Furthermore, the increasing number of gasoline-powered W124s (300E models) in junkyards is a boon for 1987 300D owners. These cars share the same body, interior, and trim parts, providing a readily available and affordable source for replacements.
Creature Comforts and Features of the ’87 300D
Despite its age, the 1987 300D offers a surprising level of creature comforts, surpassing the older Mercedes models. Standard features included ABS (Anti-lock Braking System) and a driver’s side airbag, advanced safety features for the era. Power seats with driver’s seat memory and retractable rear headrests further enhance the driving experience and passenger comfort. While these features add to the car’s appeal, they also mean there are more systems that could potentially require maintenance over time.
The Reliable 722.4 Transmission
The 1987 300D utilizes the 722.4 4-speed mechanical automatic transmission, a unit first introduced in the later W123 models. This transmission is known for its robustness and longevity, often lasting for 200,000 miles or more with proper maintenance. While overhauling this transmission is comparable in cost to other automatic transmissions and generally not a DIY job, its inherent reliability is a significant plus point.
Conclusion: Is the 1987 Mercedes 300D Right for You?
The 1987 Mercedes 300D presents a compelling package: a rewarding driving experience, classic styling, and diesel efficiency. However, potential owners must approach ownership with open eyes, acknowledging the car’s age and potential maintenance needs. While DIY maintenance can mitigate costs, a thorough inspection by a Mercedes specialist before purchase is non-negotiable. For those who appreciate robust engineering, timeless design, and are prepared for classic car ownership, the 1987 Mercedes 300D remains a smart and enjoyable choice. Further research using online resources and owner forums is highly recommended to gain a deeper understanding before making a purchase decision.
