For enthusiasts and those in the know, older Mercedes Benz diesel models represent a unique blend of robust engineering and enduring reliability. These vehicles, particularly from the late 70s to the early 90s, are renowned for their longevity and straightforward mechanics, making them a compelling choice in the used car market. If you’re seeking a dependable and classic vehicle, understanding what makes a Best Mercedes Benz in this era is crucial. This guide, drawing from expert insights, will help you navigate the process of finding a top-quality used Mercedes Benz diesel.
When considering a vintage Mercedes diesel, it’s important to understand the engines. The original author points out, “Any 300SD from 78-83 or 84 will be all iron, I’m sure, as well as any 300D or TD…there may be an exception, but I don’t think they ever put the aluminum heads in those cars.” These iron engines are indeed workhorses, known for their durability. While later six-cylinder engines offer a bit more performance, the five-cylinder diesels are celebrated for their robust nature and ease of maintenance, making them a hallmark of the best Mercedes Benz reputation in that period. Models like the 78-79 300SD and the 82-85 300D or TD are often highlighted as prime examples of this era’s engineering prowess.
Mileage on a diesel Mercedes Benz is less of a concern than consistent upkeep. As the original expert notes, “with diesels actual mileage is not as significant as diligent maintenance.” The key to finding the best Mercedes Benz in the used market is to prioritize cars with comprehensive maintenance records. Look for evidence of servicing from reputable sources, ideally Mercedes Benz dealerships or trusted independent mechanics. If the previous owner performed maintenance themselves, delve deeper into their practices and history with the car. Regular oil and filter changes are strong indicators of an owner who valued the vehicle’s longevity and performance.
The advice given is clear: “There’s nothing more expensive than a cheap Mercedes!” This rings especially true when pursuing a best Mercedes Benz in the used category. Investing in the most well-maintained vehicle you can afford upfront will save you significantly in the long run, compared to rescuing a neglected car. A thorough visual inspection is also invaluable. A car with cosmetic neglect, like paint issues, missing trim, or a dirty interior, can often signal similar neglect in engine maintenance. While exceptions exist, a clean and well-kept appearance is usually a positive sign.
It’s not unusual to find these five-cylinder diesel Mercedes Benz models with incredibly high mileage – 200,000, 350,000, or even exceeding 500,000 miles – still running powerfully and looking impressive. The expert’s own 1979 300SD with 245,000 miles, running “like new,” perfectly illustrates this point. Mercedes Benz even acknowledged this longevity by offering mileage award badges, a testament to the potential lifespan of their well-maintained vehicles.
When evaluating a used Mercedes Benz diesel, certain checks are crucial to ensure you’re selecting one of the best Mercedes Benz examples available:
- Smoke: While some smoke is expected in older engines, excessive smoke at startup or during driving can signal significant engine issues.
- Starting: A healthy diesel engine should start promptly after the glow plug light goes off, especially when cold. Hesitation could point to problems with glow plugs, compression, or valve adjustments.
- Heating and Air Conditioning: These systems can be problematic and expensive to repair in older Mercedes Benz cars, so thorough testing is essential.
- Suspension: For cars with over 120,000-150,000 miles, suspension components like bushings, ball joints, and shocks are likely to wear. Inspect for wear to avoid premature tire wear and handling issues.
- Power Locks, Engine Shut-Off, and Brakes: Malfunctions in these areas can indicate vacuum system leaks, which, while often fixable, require diagnosis.
- Rust: Rust is a major concern. Avoid cars with significant rust, especially in areas prone to water accumulation like under carpets and in the trunk.
- Leaks: Check for coolant and oil leaks, and inspect hoses and belts for wear. Some oil leakage is normal in older diesels, but excessive leakage is a red flag.
In conclusion, finding the best Mercedes Benz in the used diesel market comes down to diligent inspection and prioritizing maintenance history over mileage. By focusing on well-cared-for examples and conducting thorough checks, you can secure a durable and rewarding classic Mercedes Benz diesel that offers years of reliable service.
