🏷️ Basic Information

Make:

Mercedes-Benz

Model:

S350

Year:

1994

Chassis Code:

W140

Market Segment:

Full-size Luxury Sedan

👋 Introduction

Market Position:

The Mercedes-Benz S-Class (W140) represented the pinnacle of automotive luxury and engineering in the mid-1990s, targeting affluent buyers seeking unparalleled comfort, advanced technology, and prestigious performance.

Competitors:

Primary competitors included the BMW 7 Series (E38), Lexus LS 400 (XF20), and Jaguar XJ series.

Key Features:

Advanced safety systems (e.g., ESP debut), dual-pane acoustic glass, biometric door locks (keyless entry on some models), power-assisted doors and trunk, comprehensive climate control, and a robust construction characterized the W140 generation.

Value Proposition:

Provides owners and independent workshops with the necessary technical expertise to maintain and repair the complex systems of the 1994 S350, ensuring longevity and optimal performance of this luxury vehicle.

📋 Manual Details

Manual Title:

Mercedes-Benz S350 1994 Service Repair Manual

Manual Type:

Service and Repair Manual

Language:

English

Format:

Downloadable Digital File

Download Availability:

Immediate

📖 Manual Coverage

Systems Covered:

Engine mechanical, engine management (fuel injection, ignition), cooling system, exhaust system, transmission (automatic), drivetrain, suspension (front and rear), steering system, brakes (hydraulic, ABS), electrical system (lighting, accessories, power windows, seats, mirrors), climate control system, body and chassis, interior trim, diagnostics, troubleshooting.

Procedures Included:

Routine maintenance, troubleshooting common problems, engine overhaul, transmission service and repair, brake system servicing, suspension component replacement, steering system adjustment, electrical component testing and repair, climate control system servicing, body panel repair, diagnostic procedures, torque specifications, wiring diagrams.

Technical Depth:

Comprehensive, suitable for professional technicians and advanced DIY enthusiasts. Includes detailed diagnostic procedures, specifications, and step-by-step repair instructions.

📊 Manual Specifications

File Format:

Likely PDF (common for downloadable manuals), optimized for digital viewing and printing.

Searchable Text:

Assumed searchable due to digital format, enabling quick access to specific information.

Print Quality:

High-resolution, suitable for printing individual pages or the entire manual.

Distribution Method:

Instant download post-purchase.

⚙️ Engine Specifications

Engine Type:

M119 V8

Displacement:

4.2 Liters (4196 cc)

Bore X Stroke:

86.0 mm x 90.0 mm

Compression Ratio:

10.0:1

Horsepower:

279 hp @ 5750 rpm

Torque:

295 lb-ft @ 3900 rpm

Fuel Delivery:

Bosch Motronic M1.0 Fuel Injection

Fuel Requirement:

Premium Unleaded Gasoline (91 octane or higher)

Engine Code:

M119.970

Cooling Medium:

Water/Antifreeze mixture (50/50)

Coolant Capacity:

Approx. 12.0 liters

🔧 Transmission

Type:

4-speed Automatic (722.4)

Gear Ratios:

First: 3.60, Second: 2.39, Third: 1.47, Fourth: 1.00, Reverse: 2.93

Transmission Fluid Type:

MB 236.6 Specification Automatic Transmission Fluid (e.g., Mobil ATF 220, Pentosin ATF 1)

Transmission Fluid Capacity:

Approx. 8.0 liters (dry fill)

📐 Dimensions

Length:

5163 mm (203.3 in)

Width:

1890 mm (74.4 in)

Height:

1447 mm (57.0 in)

Wheelbase:

3140 mm (123.6 in)

Curb Weight:

Approx. 1930 kg (4255 lbs)

Gross Vehicle Weight Rating:

Approx. 2500 kg

Standard Wheel Size:

16 inch alloy

Standard Tire Size:

215/60R16

Bolt Pattern:

5 x 112 mm

🛡️ Safety Features

NHTSA Front Crash Test:

Not extensively tested by modern standards, but known for robust construction.

Active Safety Features:

Anti-lock Braking System (ABS), Electronic Stability Program (ESP) - standard on US models, Traction Control System (ASR).

Passive Safety Features:

Dual front airbags, crumple zones, side impact protection, three-point inertia-reel seatbelts with pre-tensioners, reinforced passenger cell.

Headlight Type:

Halogen projector beam (optional Xenon HID)

💡 Technology Features

Infotainment System:

Basic AM/FM/Cassette or CD player with amplifier, analog climate control displays. Optional features included premium sound systems.

Driver Assistance Features:

Cruise control, automatic climate control (THERMATIC/THERMOTRONIC), rain-sensing wipers (on some models).

Convenience Features:

Power adjustable front seats with memory, heated seats, power tilt/telescoping steering column, power windows, power mirrors, central locking, automatic dimming rearview mirror.

Diagnostic Port:

OBD-I diagnostic connector (located in engine bay or under dash), specific Mercedes-Benz proprietary diagnostic connectors for certain systems.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles or 12 months (whichever comes first) under normal driving conditions. Consult manual for severe conditions.

Transmission Fluid Change:

Recommended every 30,000 - 50,000 miles, or as per manufacturer's service schedule, especially for optimal longevity of the 722.4 unit.

Air Filter Replacement:

Inspect every 15,000 miles, replace as needed or at 30,000 miles.

Spark Plug Replacement:

Replace approximately every 60,000 miles (may vary based on plug type).

Engine Oil Specification:

API SJ or higher, SAE 0W-30 or 5W-40 synthetic recommended for optimal protection.

Engine Oil Capacity:

Approx. 8.0 liters (with filter)

Coolant Type:

Mercedes-Benz approved coolant (e.g., MB 325.0 / G05)

Brake Fluid Type:

DOT 4

Common Issues:

Head gasket leaks (especially early M119 engines), biodegradable wiring insulation degradation, ABS/ASR sensor failures, sagging headliner, door seal leaks, power window regulator issues, climate control blower motor failure, catalytic converter failure.

Key Checks:

Regular inspection of vacuum lines, coolant hoses, and electrical connectors is crucial due to age and material degradation.

📚 Vehicle History

Brand Philosophy:

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

W140 Introduction:

The W140 chassis S-Class was introduced in 1991 as the successor to the W126 S-Class, representing a significant technological leap forward and a larger, more imposing presence.

W140 Facelift:

Received a facelift in 1994, with minor styling revisions and powertrain updates.

Production Period:

1991-1998

Manufacturing Sites:

Sindelfingen, Germany

🏆 Awards & Recognition

Notable Awards:

While specific awards for the 1994 S350 are not widely publicized, the W140 S-Class was consistently recognized for its technological advancements, safety innovations, and luxurious ride quality by automotive publications worldwide.

Consumer Reports Perception:

Often praised for its build quality and comfort, but noted for higher maintenance costs and complexity compared to some competitors.