Segment:
Compact executive sedan, pioneering the diesel engine in this class for Mercedes-Benz.
Competitors:
Other compact sedans and diesel offerings of the era, though often positioned slightly above mainstream brands due to Mercedes-Benz's premium status.
Unique Selling Points:
Exceptional build quality, reliability, fuel efficiency for its time, and the prestige of the Mercedes-Benz badge.
Engine:
Diesel engine overhaul, fuel injection system, cooling system, lubrication, exhaust system, engine diagnostics and troubleshooting.
Transmission:
Manual transmission (4-speed and 5-speed) service, clutch system, driveshaft, differential.
Brakes:
Hydraulic brake system service, drum brakes, brake fluid specifications, bleeding procedures, master cylinder and wheel cylinder overhaul.
Suspension:
Front and rear suspension components, shock absorbers, springs, steering linkage, wheel alignment specifications.
Electrical:
12-volt electrical system, starter, alternator, battery, lighting, ignition system (for gasoline variants), wiring diagrams.
Bodywork:
Body panel repair, door mechanisms, glass replacement, interior trim, rust prevention and repair.
Maintenance:
Regular service intervals, oil changes, filter replacements, coolant flushes, tune-up procedures.
Repair:
Component overhaul (engine, transmission, brakes), part replacement procedures, body repair techniques.
Troubleshooting:
Diagnostic charts for common problems, fault finding for engine, transmission, and electrical systems.
Depth:
Comprehensive from basic maintenance to in-depth engine and transmission rebuilds, including detailed diagnostic procedures and specifications.
Crash Test Data:
No formal crash test ratings typical of modern vehicles, but built to high Mercedes-Benz safety standards of the era with a robust chassis.
Braking:
Hydraulic front and rear drum brakes (later models may have front discs as an option or standard).
Construction:
Integrated safety cell, robust body structure, padded dashboard (depending on year).
Oil Change Interval:
Typically every 5,000 - 7,500 km (3,000 - 5,000 miles), depending on operating conditions and oil quality of the era.
Fuel Filter Replacement:
Recommended at every major service or as needed based on fuel quality.
Air Filter Replacement:
At specified intervals, typically 10,000 - 15,000 km (6,000 - 9,000 miles).
Engine Oil Type:
API CD or similar heavy-duty diesel engine oil (e.g., SAE 10W-30 or 15W-40 depending on climate).
Engine Oil Capacity:
Approximately 5.5 liters (5.8 US quarts) with filter change.
Coolant Type:
Ethylene glycol based coolant with anti-corrosion additives (specific Mercedes-Benz coolant or equivalent).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Common Wear Items:
Rubber bushings in suspension and steering, fuel injection pump seals, glow plugs, water pump, exhaust system components.
Rust Prone Areas:
Wheel arches, sills, floor pans, and lower body panels are susceptible to rust due to age and environmental exposure.
Engine Performance:
Potential for carbon buildup in combustion chambers, injector wear, and timing issues if not properly maintained.
Heritage Association:
Part of Mercedes-Benz's legacy of producing reliable, durable, and technically advanced vehicles, particularly its early diesel offerings.
Predecessor:
Followed earlier Mercedes-Benz compact models, representing an evolution in design and engineering.
Successor:
Was part of the lineage that led to later compact Mercedes-Benz models like the W114/W115 series and eventually the C-Class.
Production Years:
Mid-1950s through early 1960s (specific to W120/W121 chassis for 180d variants).
Manufacturing Locations:
Germany
