Segment:
Mid-size luxury executive sedan
Competitors:
BMW 5 Series (E34), Audi 100/200, Lexus ES 250/300, Cadillac Seville
Design Philosophy:
Built to last, with a focus on build quality, durability, safety, and refined engineering. Known for its robust chassis and excellent ride comfort.
Technology:
Pioneered various safety and comfort features, including ABS (standard), optional airbags, and advanced suspension systems like the Automatic Differential Lock (ADS) and 4MATIC all-wheel drive.
Benefits:
Empowers owners and independent repair shops with factory-accurate information for efficient and correct maintenance and repair, potentially saving costs and ensuring longevity of the vehicle.
Engine:
Engine overhaul, oil & filter change, valve clearance adjustment, injection timing, fuel filter, air filter, V-belts, poly V-belt, intake/exhaust manifold seating, oxygen sensor, spark plugs, cooling system (level, antifreeze, component inspection, coolant replacement), engine mounts, throttle linkage.
Transmission:
Manual transmission (oil change, level check/correction), Automatic transmission (fluid/filter change, level check/correction), Clutch system (disk wear inspection, fluid level check/correction, general inspection), Transfer case (fluid change, level check/correction).
Suspension Steering Axles:
Suspension and body structure inspection, Level control (ADS), 4MATIC system fluid level, Self-leveling suspension inspection, Front axle (oil level check/correction, ball joint inspection, special tool usage), Rear axle (oil change, level check/correction, mount adjustment), Drive shaft flexible coupling inspection, Steering play check, steering bolt tightening.
Brakes:
Brake fluid level check, brake lines inspection, brake pads/disk thickness inspection, brake disk cleaning, parking brake cable inspection, parking brake adjustment, brake fluid replacement, brake test (parking brake check).
Electrical Lighting Wipers:
Warning/indicator lamps check, antenna mast cleaning, headlamp/exterior lamp inspection, windshield wiper/washer inspection, windshield wiper blade replacement.
Body Chassis Interior:
Water leakage/corrosion inspection, wheel inspection/rotation, tire inspection/pressure correction, wheel bolt tightening, fuel system condition check, exhaust flange/system connection tightening, battery fluid level check, engine compartment lower panel removal/installation, door hinge/lock lubrication, hydraulic top fluid level check/correction, sunroof rail cleaning/greasing, soft top locking tab check, windshield washer fluid level check/correction, AC refrigerant charge check, dust/active charcoal/recirculating air filter replacement, folding side mirror lubrication, hood lubrication, safety belt inspection, backrest lock operation check, lower noise encapsulation panel removal/installation, body paint damage inspection.
Maintenance:
Routine maintenance tasks such as fluid changes (engine oil, transmission, brake, coolant, power steering, washer fluid), filter replacements (oil, fuel, air, cabin), belt inspections, spark plug replacement, battery checks, tire maintenance, lubrication points, and general inspections.
Diagnostics Troubleshooting:
Implied through component inspection, system checks, and the depth of coverage of various systems, allowing for identification of faults and performance issues.
Repair Overhaul:
Detailed instructions for component replacement and repair, covering major mechanical and electrical systems, as well as body and chassis components.
Depth:
Factory-level technical depth, suitable for professional technicians and advanced DIY enthusiasts. Covers detailed procedures, specifications, and potentially diagnostic information.
Type:
4-speed Automatic Transmission (722.3xx series)
Type:
5-speed Manual Transmission
Automatic Features:
Selectable modes (e.g., Economy/Sport), torque converter lock-up for improved efficiency.
Automatic Transmission Fluid:
MB 236.6 (e.g., Mobil ATF 220, Dexron II compatible)
Manual Transmission Fluid:
MB 235.1 (e.g., Gear Oil SAE 80W/90)
Oil Change Interval:
Typically every 10,000-15,000 km (6,000-9,000 miles) or 12 months, whichever comes first (refer to manual for exact recommendation).
Transmission Fluid Change Interval:
Automatic transmission fluid and filter: often recommended at 60,000-80,000 km (37,000-50,000 miles).
Coolant Change Interval:
Typically every 2-3 years or 40,000-60,000 km (25,000-37,000 miles).
Engine Oil Specification:
API SG or higher, SAE 10W-40 or 15W-40 recommended (refer to manual for exact viscosity based on climate).
Power Steering Fluid:
MB 236.3 (e.g., Pentosin CHF 11 S or equivalent).
Brake Fluid:
DOT 4 (refer to manual for precise specification, often MB 331.0).
Common Problems:
Wire harness insulation degradation (brittle), vacuum leak issues, coolant leak points (e.g., hose connections, heat exchanger), ABS sensor failures, window regulator issues, blower motor resistor failure.
Key Checks:
Regularly inspect rubber hoses and seals for cracking/leaks, check electrical connections, maintain cooling system, and ensure proper lubrication of moving parts.
Brand Focus:
German manufacturer renowned for luxury, engineering, and pioneering automotive safety and technology.
W124 Development:
The W124 represented a significant step forward in Mercedes-Benz design and engineering, emphasizing aerodynamics, durability, and a tauter chassis compared to its predecessor (W123).
300E Positioning:
The 300E was a core model in the W124 lineup, offering a balance of performance and luxury powered by the smooth M103 inline-six engine.
Production Period:
The W124 chassis was produced from 1984 to 1997, with the 300E variant being prominent during the later half of this period, including the specified years.
