The 1984 Mercedes-Benz 300-Class, part of the W123 and W124 generations, represents a pinnacle of German engineering and build quality. Available primarily as a sedan and wagon, its model years spanned from the late 1970s into the early 1990s for the W124. Key trims included the 300D (diesel) and 300E (gasoline). These cars are celebrated for their robust construction, legendary reliability, and timeless design, making them highly sought after classics.
The Good
The 1984 300-Class offers exceptional reliability, a smooth and comfortable ride, and enduring design. Its practical diesel engines provide good fuel economy, while the build quality assures long-term value for both the pragmatic and the sentimentally attached owner.
The Bad
Owners should watch out for rust, particularly in the wheel wells and rocker panels. Diesel models may experience injector pump issues and vacuum leaks. Electrical components can also be a concern as the vehicle ages, and suspension bushings may wear out.
1984 Mercedes-Benz 300-Class: Quick Overview
- Engine Options: The 1984 Mercedes-Benz 300-Class offered primarily diesel engines, with the most common being the 3.0-liter inline-five cylinder (OM617 for W123, OM603 for W124). Gasoline options included inline-four and inline-six engines like the 2.3-liter M102 and 3.0-liter M103.
- Horsepower: Diesel engines typically produced around 70-88 horsepower, while gasoline engines ranged from approximately 108 hp to 180 hp depending on the specific model and engine.
- Fuel Economy: The diesel variants were known for their excellent fuel efficiency, often achieving 25-30 MPG combined. Gasoline engines were less economical, typically in the 18-22 MPG range.
- 0-60 Times: Due to their emphasis on durability over performance, 0-60 times were not a strong suit. Diesel models could take upwards of 15-18 seconds, while gasoline models were quicker, often in the 9-12 second range.
- Towing Capacity: Mercedes-Benz did not heavily promote towing for these passenger-oriented vehicles. While capable of light towing, specific capacities were not a primary feature and vary by model and region.
- Trim-Level Features:
300D (Diesel): Focused on economy and longevity. Standard features often included power steering, power brakes, automatic transmission, vinyl or MB-Tex upholstery, basic radio, and manual climate control.
300E (Gasoline): Offered a step up in performance and luxury. Features could include upgraded upholstery (e.g., velour), power windows, power sunroof, cruise control, air conditioning, and a more refined suspension setup. Options could extend to leather seats, heated seats, and alloy wheels. Both body styles (sedan and wagon) offered similar levels of equipment within their respective trims.
1984 Mercedes-Benz 300-Class Specifications
Vehicle Information
| Year | 1984 |
| Make | Mercedes-Benz |
| Model | 300-Class |
| Trim | - |
| Style | 2-Door Coupe |
| Type | Coupe |
| Category | Compact Car |
Manufacturing Details
| Made In | Germany |
| Manufacturing City | SINDELFINGEN |
Dimensions
| Doors | 2-Door |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 3L I5 |
| Engine Size | 3L |
| Engine Cylinders | 5 |
| Transmission | 4-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 4-Speed |
| Drivetrain | Rear-Wheel Drive |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 1984 Mercedes-Benz 300-Class Have?
The 1984 Mercedes-Benz 300-Class is generally renowned for its exceptional long-term reliability, often exceeding 300,000 miles with proper maintenance. However, like any older vehicle, certain issues are frequently reported. Rust is a significant concern, particularly on the W123 models, affecting areas like the fenders, rocker panels, floorboards, and around the windshield. By 1984, the W124 generation was introducing more sophisticated electronics, which, while generally reliable, can become a point of failure with age.
Common issues include:
Recalls for this era are less common for widespread mechanical failures and more often related to specific safety components or minor manufacturing defects. Given the vehicle's age, most issues are a result of wear and tear rather than inherent design flaws, but proactive maintenance is key. The W123 generation (pre-1986) is slightly more prone to severe rust than the early W124 models.
Common issues include:
- Diesel Engines (OM617/OM603): While robust, these engines can suffer from injector pump seal leaks, glow plug failures, and occasional head gasket issues. Vacuum leaks within the engine management system can also affect performance and starting.
- Transmission: Automatic transmissions are generally durable but can develop shifting problems or leaks if not serviced regularly.
- Suspension: Worn-out ball joints, tie rod ends, and control arm bushings are common due to age and mileage, leading to sloppy handling and uneven tire wear.
- Electrical System: Older wiring harnesses can degrade, leading to intermittent electrical gremlins. Issues with the central locking system, power windows, and instrument cluster illumination are not uncommon.
- Climate Control: The venerable Behr climate control systems, while effective, can develop issues with the blower motor, evaporator core (leading to AC failure), and vacuum actuators that control air flow.
Recalls for this era are less common for widespread mechanical failures and more often related to specific safety components or minor manufacturing defects. Given the vehicle's age, most issues are a result of wear and tear rather than inherent design flaws, but proactive maintenance is key. The W123 generation (pre-1986) is slightly more prone to severe rust than the early W124 models.
How long will the 1984 Mercedes-Benz 300-Class last?
Based on owner data and maintenance records, the 1984 Mercedes-Benz 300-Class is capable of reliably serving for 300,000 to 500,000 miles, and many examples exceed this considerably. With diligent maintenance, including regular oil changes, filter replacements, and timely addressing of minor issues, these vehicles can last for decades. The diesel models, in particular, are legendary for their longevity, often outlasting their original owners. The primary weakness over time is susceptibility to rust, which can compromise structural integrity if not addressed. However, the core mechanical components—engine, transmission, and drivetrain—are built to endure extreme mileage. Properly maintained examples can easily see 20-30 years or more of service.
What Technology & Safety Features are Included?
The 1984 Mercedes-Benz 300-Class, while not a technological marvel by today's standards, offered a solid array of features focused on safety and comfort for its era. Built-in tech was relatively basic. Entertainment typically consisted of an AM/FM radio, often with a cassette player as an option. Sound systems were functional but lacked the complexity of modern units.
Driver-assistance features were minimal. Cruise control was a notable optional convenience, and power steering was standard, making the car easy to maneuver. Some models might have featured a rudimentary trip computer.
Safety was a strong suit. Standard safety features included crumple zones, a reinforced passenger cell, four-wheel disc brakes (often ABS on higher trims and later models, though ABS was not standard on all 1984 models), and three-point seatbelts. The steering column was designed to collapse in a frontal impact. Optional safety features could include fog lights and sometimes a limited-slip differential.
Crash-test ratings for vehicles from this specific year are not as comprehensively documented or standardized as modern tests. However, Mercedes-Benz vehicles of this period consistently performed well in independent safety evaluations due to their robust construction and engineering. The W123 chassis, in particular, was known for its structural integrity. The W124 generation continued this tradition, often cited for its safety engineering. While specific crash-test scores for the 1984 model year are hard to pin down in current databases, the overall reputation for safety and durability is very high for this generation.
Driver-assistance features were minimal. Cruise control was a notable optional convenience, and power steering was standard, making the car easy to maneuver. Some models might have featured a rudimentary trip computer.
Safety was a strong suit. Standard safety features included crumple zones, a reinforced passenger cell, four-wheel disc brakes (often ABS on higher trims and later models, though ABS was not standard on all 1984 models), and three-point seatbelts. The steering column was designed to collapse in a frontal impact. Optional safety features could include fog lights and sometimes a limited-slip differential.
Crash-test ratings for vehicles from this specific year are not as comprehensively documented or standardized as modern tests. However, Mercedes-Benz vehicles of this period consistently performed well in independent safety evaluations due to their robust construction and engineering. The W123 chassis, in particular, was known for its structural integrity. The W124 generation continued this tradition, often cited for its safety engineering. While specific crash-test scores for the 1984 model year are hard to pin down in current databases, the overall reputation for safety and durability is very high for this generation.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
1984 Mercedes-Benz 300-Class Prices and Market Value
When new in 1984, the Mercedes-Benz 300-Class was a premium vehicle, with prices typically ranging from $25,000 to $35,000 (equivalent to $70,000-$100,000+ today), depending on the trim level and options. These vehicles experienced relatively slow depreciation initially due to their high quality and brand prestige. Currently, used market prices vary significantly based on condition, mileage, and specific model. Well-maintained examples, especially diesel sedans with lower mileage and good service history, can fetch anywhere from $4,000 to $15,000 or more. Rusted or high-mileage examples can be found for under $2,000. Factors affecting resale value include the presence of rust, originality of parts, service records, and desirability of the specific trim (e.g., wagons or coupes might command a premium).
1984 Mercedes-Benz 300-Class Cost of Ownership
Owning a 1984 Mercedes-Benz 300-Class can be surprisingly economical, especially diesel variants. Fuel costs are low due to excellent MPG. Insurance is typically reasonable, often falling into collector car categories. Maintenance costs can be moderate; while routine tasks are manageable, parts can be more expensive than for mainstream brands. However, the vehicle's robust build means fewer unexpected major repairs if well-maintained. Repair costs can escalate if specialized parts are needed or if extensive rust repair is required. Overall, it's more economical than a modern luxury car but requires more investment than a typical economy car, with long-term durability offsetting higher initial repair part costs.
1984 Mercedes-Benz 300-Class Fuel Efficiency
Fuel Type
Diesel
Fuel Capacity
-
City Mileage
21 miles/gallon
Highway Mileage
-
1984 Mercedes-Benz 300-Class Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
1984 Mercedes-Benz 300-Class Insurance
Insurance for a 1984 Mercedes-Benz 300-Class is moderately priced, reflecting its status as a Coupe with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1984 Mercedes-Benz 300-Class Compare to Other Coupe?
In 1984, the Mercedes-Benz 300-Class competed against luxury sedans from brands like BMW, Audi, and domestic luxury marques such as Cadillac.
Performance: Competitors like the BMW 5-Series (e.g., 528e) often offered more spirited performance, particularly with gasoline engines, while the 300-Class, especially diesel models, prioritized efficiency and effortless cruising over acceleration.
Features: Mercedes-Benz typically led in build quality and robust engineering. While competitors might have offered more cutting-edge electronics or creature comforts as options, the 300-Class compensated with a sense of solidity and superior materials that stood the test of time.
Reliability: This is where the 300-Class truly shone. While German rivals like BMW were also known for durability, the diesel Mercedes-Benz models were legendary for their longevity, often surpassing many competitors in terms of miles driven and reduced frequency of major mechanical issues. American luxury cars of the era, while offering comfort, generally lagged behind in long-term mechanical reliability and build precision.
Price: The 300-Class was priced at the higher end of the spectrum, comparable to or exceeding many of its German rivals.
Alternatives:
For those prioritizing outright reliability and fuel economy, the 1984 Mercedes-Benz 300-Class, particularly the diesel variants, remains a strong choice and arguably superior to many rivals in those specific aspects.
Performance: Competitors like the BMW 5-Series (e.g., 528e) often offered more spirited performance, particularly with gasoline engines, while the 300-Class, especially diesel models, prioritized efficiency and effortless cruising over acceleration.
Features: Mercedes-Benz typically led in build quality and robust engineering. While competitors might have offered more cutting-edge electronics or creature comforts as options, the 300-Class compensated with a sense of solidity and superior materials that stood the test of time.
Reliability: This is where the 300-Class truly shone. While German rivals like BMW were also known for durability, the diesel Mercedes-Benz models were legendary for their longevity, often surpassing many competitors in terms of miles driven and reduced frequency of major mechanical issues. American luxury cars of the era, while offering comfort, generally lagged behind in long-term mechanical reliability and build precision.
Price: The 300-Class was priced at the higher end of the spectrum, comparable to or exceeding many of its German rivals.
Alternatives:
- BMW 5-Series (E28): Offers a more engaging driving experience and better performance from its gasoline engines, but potentially less outright durability than the diesel Mercedes.
- Audi 5000/100: Provided strong all-wheel-drive options (Quattro) and a comfortable ride, but often faced reliability concerns, particularly with early automatic transmissions.
- Volvo 240/740: Known for exceptional safety and durability, though with a less luxurious interior and more utilitarian driving feel.
For those prioritizing outright reliability and fuel economy, the 1984 Mercedes-Benz 300-Class, particularly the diesel variants, remains a strong choice and arguably superior to many rivals in those specific aspects.
Final Verdict: Is the 1984 Mercedes-Benz 300-Class a Good Coupe?
The 1984 Mercedes-Benz 300-Class is ideal for individuals who value enduring quality, mechanical simplicity (especially diesel models), and exceptional long-term durability over blistering performance or modern tech. It's a smart buy for those seeking a reliable daily driver or a comfortable classic that won't break the bank to maintain, provided they are willing to perform regular upkeep. It is absolutely worth buying in the used market, especially for well-maintained diesel sedans or wagons. Condition is paramount; prioritize rust-free examples with thorough service records. Avoid high-mileage, neglected cars unless you're prepared for significant restoration work. For a true classic experience with practical usability, this Mercedes remains a compelling choice.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.