Benz Diesel Cars have long been celebrated for their durability, longevity, and robust engineering. For those in the market for a dependable vehicle, a used Benz diesel car can be an excellent choice, offering a unique blend of classic Mercedes-Benz quality and fuel efficiency. However, like any used vehicle, careful inspection and understanding key factors are crucial before making a purchase. This guide, drawing upon expert insights, will walk you through what to look for to ensure you choose a Benz diesel car that will provide years of reliable service.
Choosing a Benz diesel car often means prioritizing longevity and robust performance over fleeting trends. These vehicles, particularly models from the late 70s to the early 90s, are renowned for their sturdy construction and engines designed to withstand hundreds of thousands of miles. The five-cylinder diesel engine, found in models like the 300SD, 300D, and 300TD, is particularly lauded as a “workhorse” for its durability and ease of maintenance. While later six-cylinder diesel engines offer slightly enhanced performance, the five-cylinder remains a favorite among enthusiasts for its sheer resilience.
When considering a used Benz diesel car, the mantra should be “maintenance over mileage.” While odometer readings might seem dauntingly high compared to gasoline vehicles, for a diesel Mercedes, diligent upkeep is the more significant indicator of its health and remaining lifespan. A Benz diesel car with 200,000, 300,000, or even 500,000+ miles, if properly maintained, can still run smoothly and reliably.
Key Considerations When Buying a Used Benz Diesel Car
To ensure you’re investing in a Benz diesel car that will serve you well, focus on these critical areas:
Maintenance History is Paramount
The most crucial factor when evaluating a used Benz diesel car is its maintenance history. Seek out vehicles with comprehensive records, ideally from Mercedes-Benz dealerships or reputable independent shops. Receipts for regular servicing, oil changes, and filter replacements are positive signs of a caring owner. If the previous owner performed DIY maintenance, inquire deeply about their expertise and inspect their other vehicles if possible. Consistent maintenance records are a far stronger indicator of a Benz diesel car’s condition than low mileage alone. Remember, “There’s nothing more expensive than a cheap Mercedes!” Investing in a well-maintained example upfront will save you significantly in the long run compared to rescuing a neglected one.
A visual inspection can also reveal much about the car’s history of care. Cosmetic neglect, such as numerous dents, scratches, missing trim, or a poorly kept interior, can often reflect a similar lack of attention to mechanical maintenance. While exceptions exist, a clean and well-presented car is generally a more promising prospect.
Engine Type and Mileage
While the five-cylinder diesel engine is highly regarded, six-cylinder diesel engines in later models (late 80s/early 90s) also offer good performance. Aluminum heads were introduced around the mid-to-late 80s, particularly in W126 chassis cars like the 300SD. However, older models (pre-mid 80s) like the 300D and TD typically feature all-iron engines, known for their robustness. Regardless of the specific engine, focus on condition and maintenance over the age or exact mileage figure.
Essential Checks Before Purchase
Conduct thorough inspections of these key areas to assess the Benz diesel car’s condition:
Engine Smoke
Some smoke from an older diesel engine is expected, especially on startup. However, excessive smoke, either at startup or while driving, can signal significant engine problems. Observe the color and amount of smoke to gauge potential issues.
Cold Start Performance
A healthy Benz diesel car should start relatively easily when cold after the glow plug light goes off. Difficulty starting could point to issues with glow plugs, the glow plug relay, low compression, or valve adjustments.
Heating and Air Conditioning
These systems are known weak points in older Mercedes-Benz vehicles and can be expensive to repair. Thoroughly test both the heating and air conditioning to ensure they are functioning correctly.
Suspension
For Benz diesel cars with over 120,000-150,000 miles, the suspension should be carefully inspected. Worn bushings, ball joints, and shocks are common at this mileage and can lead to premature tire wear, poor handling, and a harsh ride. Suspension work can be costly, so factor this into your purchase consideration.
Power Locks and Engine Shut-off
Test the power locks and ensure the engine shuts off immediately when the key is turned off. Malfunctions in these areas, along with a hard brake pedal, can indicate vacuum system leaks, which, while often inexpensive to fix, can be tedious to diagnose.
Rust
Rust is a major concern for older vehicles, especially those from northern climates. Avoid Benz diesel cars with significant rust, as it is extremely difficult to eradicate and will progressively worsen. Check under carpets and in the trunk for signs of water ingress, which can lead to rust.
Leaks and Hoses
Inspect for coolant and oil leaks. While some minor oil seepage is typical in older diesels, excessive leaking is a red flag. Check the condition of hoses and belts for cracking or wear, as these will eventually need replacement.
Conclusion
Purchasing a used Benz diesel car can be a rewarding experience, providing access to a vehicle renowned for its durability and engineering excellence. By prioritizing maintenance history over mileage, conducting thorough inspections, and focusing on the key areas outlined above, you can confidently select a Benz diesel car that will offer many more years of reliable and enjoyable driving. Remember to buy the best example you can afford and always prioritize a well-maintained vehicle to avoid costly repairs down the line.
