🏷️ Basic Information

Make:

Mercedes-Benz

Model:

124 Sedan

Model Variant:

300E

Model Year:

1993

Engine Type:

Inline-6

Engine Displacement:

2.8 Liters

Chassis Code:

W124

Engine Code:

M104.942

👋 Introduction

Vehicle Class:

Executive Sedan (E-Segment)

Reputation:

Renowned for build quality, durability, and engineering excellence; often referred to as the 'last of the true Mercedes'.

Competitors:

BMW 5 Series (E34), Audi 100/A6 (C3/C4), Lexus LS 400 (though larger class), Volvo 960.

Design:

Timeless Bruno Sacco styling, aerodynamic efficiency, robust construction.

Engineering:

Over-engineered for longevity, sophisticated multi-link rear suspension, advanced (for its time) M104 engine.

Manual Value:

Essential for maintaining the longevity and performance of a classic Mercedes-Benz, offering significant cost savings over dealership repairs.

📋 Manual Details

Primary Coverage:

Service and Repair

Secondary Coverage:

Maintenance, Troubleshooting, Diagnostics

Estimated Pages:

700-900

Type:

Factory Service Manual / Workshop Manual

Language:

English

Format:

Digital PDF (Instant Download)

📖 Manual Coverage

Engine:

Detailed specifications, disassembly, assembly, timing, cooling, lubrication, fuel delivery (KE-Jetronic/H.E.I.K.), ignition, emissions control, M104 engine specifics.

Transmission:

4-speed automatic (722.3xx) and 5-speed manual (717.4xx) service, diagnostics, fluid specifications, torque converter lock-up, shift control.

Drivetrain:

Rear-wheel drive, differential, axle shafts, driveshaft, universal joints.

Suspension:

Front independent (MacPherson struts), rear independent multi-link, springs, shock absorbers, control arms, bushings, anti-roll bars, ride height adjustment (if applicable).

Brakes:

Front vented discs, rear discs, hydraulic system, ABS (Anti-lock Braking System) diagnostics and repair, brake fluid specifications, caliper and rotor replacement.

Steering:

Power-assisted recirculating ball steering, steering column, linkage, power steering pump, fluid specifications.

Electrical:

Battery, charging system (alternator, regulator), starter motor, fuses, relays, lighting (headlights, taillights, interior), horn, wipers, washers, power windows, power locks, power seats, climate control electricals, wiring diagrams for all circuits.

Body:

Body panel removal and installation, door mechanisms, window regulators, sunroof operation, interior trim, exterior trim, bumpers, hinges, latches.

Climate Control:

HVAC system components, compressor, condenser, evaporator, heater core, refrigerant R134a (post-transition), control panel, ducting, fan operation.

Fuel System:

Fuel tank, fuel pump, fuel filter, fuel lines, fuel pressure regulator, injectors, mass airflow sensor (MAF), throttle body, fuel pump relay.

Exhaust System:

Exhaust manifolds, catalytic converter, mufflers, pipes, oxygen sensors (O2 sensors).

Maintenance:

Oil changes, filter replacements (oil, air, fuel), spark plug replacement, coolant flush and fill, belt inspection and replacement, brake fluid flush, transmission fluid and filter service.

Troubleshooting:

Diagnostic charts, symptom-based troubleshooting for common issues (e.g., engine misfires, starting problems, electrical faults).

Repair:

Engine component replacement (head gasket, pistons, valves), transmission overhaul, brake system repair, suspension component replacement, electrical component diagnosis and repair, body panel repair.

Diagnostics:

OBD-I (On-Board Diagnostics) code retrieval, sensor testing, actuator testing, voltage and resistance measurements.

Adjustments:

Ignition timing (if adjustable), idle speed, valve lash (if applicable), parking brake adjustment.

Depth:

Comprehensive: Covers everything from routine maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures and wiring diagrams.

Accuracy:

Factory-level accuracy and detail, essential for professional mechanics and serious DIY enthusiasts.

📊 Manual Specifications

Type:

Searchable PDF

Quality:

High-resolution scans, clear text and diagrams, printable.

Readability:

Optimized for digital viewing and printing, ensuring clarity of diagrams and text.

Digital Format:

N/A (Digital)

Digital Format:

N/A (Digital)

⚙️ Engine Specifications

Engine Code:

M104.942

Configuration:

DOHC 24-valve Inline-6

Displacement:

2799 cc (2.8 Liters)

Horsepower:

197 hp @ 5700 rpm (approximate, depending on market)

Torque:

265 Nm (195 lb-ft) @ 4000 rpm (approximate)

Compression Ratio:

10.0:1

Injection System:

Bosch KE-Jetronic with Electronic Control (H.E.I.K.)

Fuel Type:

Unleaded Gasoline (Premium)

Type:

Liquid-cooled

Oil Capacity:

7.5 Liters (8.0 US Quarts) with filter change

Recommended Oil Viscosity:

SAE 10W-30 or 10W-40 (check owner's manual for specific climate recommendations)

🔧 Transmission

Type:

4-speed Automatic (722.3xx series)

Type:

5-speed Manual (717.4xx series)

Automatic Features:

Hydraulic torque converter, electronic transmission control (ETC), Sport/Economy modes (on some variants).

Capacity:

Approx. 8.0 Liters (17.0 Pints) for full fill, 4.5 Liters (9.5 Pints) for torque converter drain and fill.

Type:

Mercedes-Benz MB 236.1 or equivalent (e.g., ATF Dexron II/III, but MB spec is preferred).

📐 Dimensions

Length:

4740 mm (186.6 in)

Width:

1740 mm (68.5 in)

Height:

1420 mm (55.9 in)

Wheelbase:

2800 mm (110.2 in)

Curb Weight:

Approx. 1500-1550 kg (3307-3417 lbs), depending on options.

Gross Vehicle Weight Rating:

Approx. 2000 kg (4409 lbs)

🛡️ Safety Features

NHTSA Front Impact:

Not rated under current NHTSA standards, but known for robust construction.

ABS:

Standard Anti-lock Braking System (Bosch ABS II).

Traction Control:

Optional (ASR - Acceleration Skid Control on some models).

Airbags:

Driver's airbag standard; passenger airbag optional or standard on later models within this year range.

Seatbelts:

3-point automatic front seatbelts, 3-point rear seatbelts.

Body Structure:

Reinforced safety cell, energy-absorbing crumple zones front and rear.

💡 Technology Features

Audio System:

Factory fitted Becker radio/cassette systems, with provisions for CD changers on some models. Manual covers head unit removal and basic troubleshooting.

ABS:

Standard, with detailed diagnostic information in the manual.

System Type:

Automatic Climate Control (ACC) available as an option, offering precise temperature regulation. Manual covers its complex operation and repair.

🔧 Maintenance

Oil Change:

Every 10,000-15,000 km (6,000-10,000 miles) or 1 year, whichever comes first (using synthetic oil).

Air Filter Replacement:

Every 30,000-50,000 km (20,000-30,000 miles).

Fuel Filter Replacement:

Every 40,000-60,000 km (25,000-37,000 miles).

Spark Plug Replacement:

Every 100,000 km (60,000 miles) with platinum or iridium plugs; earlier with standard copper plugs (refer to manual).

Coolant Flush:

Every 2-3 years or 50,000 km (30,000 miles).

Transmission Service:

Every 60,000-100,000 km (37,000-60,000 miles) for fluid and filter change (or as per manual).

Coolant Type:

Mercedes-Benz Specification 325.0 (Glysantin G48 or equivalent blue ethylene glycol based coolant).

Brake Fluid Type:

DOT 4

Power Steering Fluid Type:

Mercedes-Benz Specification 236.3 or 236.4 (ATF DEXRON II is often acceptable but MB spec is best).

Wiring Harness:

Biodegradable insulation on some wiring harnesses can degrade over time, leading to electrical issues. The manual covers diagnosis and repair.

Oil Leaks:

Valve cover gaskets, oil pan gaskets, and front/rear main seals are common wear items. Manual provides procedures for replacement.

Suspect Components:

Water pump seals, thermostat housing, vacuum lines, and certain suspension bushings can require replacement with age.

📚 Vehicle History

Marque Legacy:

Mercedes-Benz is synonymous with engineering excellence, luxury, safety, and durability, with a long history of innovation in automotive technology.

W124 Lineage:

The W124 generation (1984-1995) is celebrated as one of Mercedes-Benz's most over-engineered and durable models. The 300E variant, with the M104 engine, represented a significant update in performance and technology over earlier 300E models.

Manufacturing Location:

Germany

Production Years For W124 Sedan:

1984-1995

Key Updates For 1993:

Transition to R134a refrigerant for A/C, potential updates to engine management and safety features.

🏆 Awards & Recognition

Industry Awards:

The W124 platform received numerous accolades for its engineering and durability during its production run, often cited in automotive publications as a benchmark for its class.

Consumer Reports Heritage:

Consistently rated highly for reliability and owner satisfaction in its era, contributing to its strong residual values.