🏷️ Basic Information

Make:

Mercedes-Benz

Model:

300SE

Year:

1993

Chassis Code:

W140

Engine Code:

M104.990

Transmission Code:

722.5 (5-speed automatic)

👋 Introduction

Positioning:

The Mercedes-Benz 300SE (W140) represented the pinnacle of luxury and engineering in the early 1990s, targeting the executive and affluent buyer. This manual caters to owners and independent workshops specializing in high-end German automobiles.

Competitors:

Competed directly with vehicles such as the BMW 7 Series (E32), Lexus LS400 (XF10), and Audi V8 Quattro.

Vehicle Highlights:

The W140 generation was known for its substantial build quality, advanced (for its time) technology, and serene ride. The 300SE offered a refined straight-six engine, a comfortable and spacious interior, and a suite of luxury features.

Value:

This comprehensive service manual is an indispensable resource for maintaining the longevity and performance of a 1993 Mercedes-Benz 300SE. It empowers users with the detailed technical knowledge to perform all necessary maintenance and repairs accurately and efficiently.

📋 Manual Details

Engine:

Yes

Transmission:

Yes

Brakes:

Yes

Suspension:

Yes

Electrical System:

Yes

Bodywork And Chassis:

Yes

HVAC:

Yes

Fuel System:

Yes

Cooling System:

Yes

Exhaust System:

Yes

Interior Trim And Appointments:

Yes

Diagnostic Troubleshooting:

Yes

Estimated Pages:

1000+

Type:

Factory Service Manual / Workshop Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Complete engine overhaul, including cylinder head, block, pistons, connecting rods, crankshaft, camshafts, timing system (chain, tensioners, guides), valve train.

Engine Management:

Bosch LH-Jetronic fuel injection, ignition system, electronic control unit (ECU) diagnosis and troubleshooting, sensor data, component testing (MAF, O2, TPS, crank position).

Transmission Automatic:

Detailed procedures for 722.5 5-speed automatic transmission, including hydraulic control, valve body, torque converter, clutch packs, electronic control module (ETC), troubleshooting, and fluid service.

Brakes System:

Front and rear brake system service, including ABS (Anti-lock Braking System) components, hydraulic lines, calipers, rotors, pads, brake fluid flush and bleed procedures, parking brake.

Suspension And Steering:

Front and rear independent suspension, shock absorbers, springs, control arms, ball joints, tie rods, steering gearbox, power steering system, alignment specifications.

Electrical System And Wiring:

Comprehensive wiring diagrams for all vehicle systems, fuse box layout, relay functions, component testing, starter, alternator, battery, lighting systems, power windows, mirrors, central locking.

HVAC System:

Automatic climate control (ACC) system, refrigerant service, blower motor, control panel, diagnostic procedures, component replacement.

Fuel And Emissions:

Fuel tank, fuel pump, fuel filter, fuel lines, evaporative emissions control (EVAP) system, catalytic converter, exhaust manifold, O2 sensors.

Cooling System:

Radiator, coolant hoses, water pump, thermostat, cooling fan (electric/viscous coupling), coolant capacity and specifications.

Body And Chassis:

Body panel removal and installation, door mechanisms, window regulators, sunroof operation, interior trim components, seal replacement, structural components.

Routine Maintenance:

Oil change, filter replacement (oil, air, fuel, cabin), spark plug replacement, fluid level checks and top-offs, tire rotation and pressure. Specific intervals provided.

Troubleshooting Guides:

Systematic diagnostic procedures for common and uncommon issues, symptom-based troubleshooting, fault code interpretation (where applicable).

Component Replacement:

Step-by-step instructions for replacing major and minor components across all vehicle systems.

Rebuilding Procedures:

Detailed procedures for rebuilding major components such as the engine and transmission.

Torque Specifications:

Precise torque values for all critical fasteners during assembly and disassembly.

Special Tools And Equipment:

Identification and usage instructions for specialized tools required for specific repairs.

Depth:

Comprehensive and professional level, suitable for dealership technicians and experienced DIY mechanics. Covers everything from basic adjustments to complete overhauls and complex diagnostics.

📊 Manual Specifications

PDF Quality:

High resolution, scanned or digitally produced for clarity and legibility of text and diagrams.

Searchable:

Yes, text-searchable PDF for quick information retrieval.

Print Readability:

Designed to be fully printable with clear diagrams and text.

Binding:

N/A (Digital PDF format)

Paper:

N/A (Digital PDF format)

⚙️ Engine Specifications

Engine Type:

Inline 6-cylinder, DOHC, 24-valve

Displacement:

3.2 Liters (3199 cc)

Horsepower:

228 hp @ 5500 rpm

Torque:

232 lb-ft @ 4400 rpm

Injection System:

Bosch LH-Jetronic Electronic Fuel Injection

Fuel Type:

Unleaded Premium Gasoline (91 Octane or higher recommended)

Ignition Type:

Distributorless Electronic Ignition (EZL/HWA)

Cooling Capacity:

Approximately 10.0 Liters (coolant mix)

Oil Capacity:

Approximately 8.0 Liters (with filter change)

Recommended Oil Viscosity:

SAE 0W-40 or 5W-40 (check manual for specific MB approval)

🔧 Transmission

Transmission Type:

5-speed Automatic (722.5)

Optional Transmission:

N/A for 1993 300SE

Transmission Features:

Electronic control, Comfort/Sport mode selection, limp-home mode capability.

Automatic Transmission Fluid:

MB 236.8 (e.g., Mobil ATF 220, Castrol TQ-D, or equivalent approved fluid)

Transmission Fluid Capacity:

Approximately 8.0 Liters (service refill, total capacity higher)

📐 Dimensions

Length:

5113 mm (201.3 in)

Width:

1886 mm (74.3 in)

Height:

1473 mm (58.0 in)

Wheelbase:

3040 mm (119.7 in)

Curb Weight:

Approximately 1850 kg (4079 lbs)

Gross Vehicle Weight Rating:

Approximately 2400 kg (5291 lbs)

🛡️ Safety Features

Crash Test Information:

Specific official crash test ratings from NHTSA/IIHS for the 1993 W140 are limited, but Mercedes-Benz engineering focused on occupant safety with advanced passive restraint systems for its era.

Active Safety Features:

Anti-lock Braking System (ABS), Traction Control System (ASR - optional or standard depending on market), power steering.

Passive Safety Features:

Reinforced safety cage, front and side impact energy-absorbing zones, driver and front passenger airbags, height-adjustable seat belts with pretensioners.

💡 Technology Features

Infotainment System:

Basic Mercedes-Benz radio with cassette player, optional CD changer. Analog displays and controls.

Driver Assistance Features:

Cruise control, ABS, ASR (optional).

Connectivity Features:

N/A (No factory Bluetooth or advanced connectivity options)

Comfort And Convenience:

Dual-zone automatic climate control, power adjustable seats with memory, heated seats, power windows, power sunroof, power mirrors, remote central locking, self-leveling suspension (optional). Detailed troubleshooting for these systems is covered.

🔧 Maintenance

Oil And Filter Change:

Every 15,000 km or 12 months, whichever comes first (synthetic oil recommended).

Air Filter Replacement:

Every 30,000 km or 24 months.

Fuel Filter Replacement:

Every 30,000 km or 24 months.

Spark Plug Replacement:

Every 60,000 km (using specified platinum or iridium plugs).

Transmission Fluid Service:

Every 60,000 km or 48 months, including filter replacement.

Brake Fluid Flush:

Every 24 months.

Coolant Type:

MB 325.0 or 326.0 (Antifreeze/Coolant Concentrate, blue or green, mix 50/50 with distilled water)

Power Steering Fluid:

MB 236.3 (e.g., Pentosin CHF 11S or equivalent)

Brake Fluid Type:

DOT 4 (MB 331.0 specification)

Common Problems:

Vacuum hose leaks (affecting central locking, HVAC, etc.), window regulator failures, biodegradable wiring insulation breakdown, SRS system warning lights, differential seal leaks, early ABS sensor issues, catalytic converter premature failure.

Common Problems Mitigation:

The manual addresses these by providing diagnostic steps for vacuum leaks, detailed procedures for window regulator replacement, and guidance on electrical system troubleshooting.

📚 Vehicle History

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, and safety, dating back to the invention of the automobile.

W140 Development:

The W140 S-Class was a radical departure and a significant technological leap from its predecessor (W126). It was designed to set new benchmarks in automotive luxury, safety, and innovation, sometimes referred to as 'over-engineered'.

Production Years:

W140 Series: 1991–1998

Manufacturing Location:

Germany (Sindelfingen plant)

🏆 Awards & Recognition

Industry Acclaim:

While the W140 generation was often criticized for its size and cost, it was widely recognized as a benchmark for luxury, safety, and engineering quality, solidifying Mercedes-Benz's position in the ultra-luxury sedan market.