🏷️ Basic Information

Make:

Mercedes-Benz

Model:

300TE

Year:

1990

Chassis Code:

W124

Engine Code Variant:

M103.983

Transmission Code Variant:

722.424 (4-speed Automatic)

👋 Introduction

Positioning:

The 1990 Mercedes-Benz 300TE (W124 chassis) represented the pinnacle of mid-size luxury estate cars, known for its build quality, durability, and advanced engineering for its era.

Competitors:

Competed with other premium European estate cars such as the BMW 5 Series Touring, Audi 100 Avant, and Volvo 240/740/940 series.

Vehicle Highlights:

Robust construction, sophisticated multi-link rear suspension, powerful inline-six engine, comfortable and refined interior, legendary Mercedes-Benz build quality.

Value Proposition:

An indispensable resource for owners and technicians to maintain, diagnose, and repair the 1990 Mercedes-Benz 300TE, ensuring its longevity and optimal performance.

📋 Manual Details

Primary Coverage:

Service and Repair

Secondary Coverage:

Maintenance, Troubleshooting, Diagnostics, Electrical Systems, Engine, Transmission, Suspension, Brakes, Bodywork, HVAC

Estimated Page Count:

1500+

Type:

Official Factory Service Manual (Digitized)

Language:

English

Format:

Software (Digital)

📖 Manual Coverage

Engine Mechanical:

Full Engine Overhaul, Timing System, Lubrication System, Cooling System, Fuel Injection System (K-Jetronic)

Engine Electrical:

Ignition System, Engine Control Unit (ECU) Diagnostics, Sensor Identification and Testing

Transmission:

Automatic Transmission (722.4) Overhaul, Hydraulic System, Valve Body, Torque Converter, Shift Linkage

Drivetrain:

Rear Axle, Driveshaft, CV Joints, Limited Slip Differential (if equipped)

Suspension And Steering:

Front and Rear Suspension Components, Shock Absorbers, Springs, Bushings, Power Steering System, Steering Gear

Brakes:

Front and Rear Disc Brakes, ABS (Anti-lock Braking System) Components and Troubleshooting, Brake Lines, Master Cylinder

Electrical System:

Complete Wiring Diagrams, Fuse and Relay Locations, Lighting Systems, Power Windows, Central Locking, Wipers, Horn

Climate Control:

HVAC System Operation, Refrigerant Handling, Blower Motor, Heater Core, Air Conditioning Compressor

Body And Interior:

Door Mechanisms, Seat Adjustments, Sunroof Operation, Exterior Trim, Interior Trim Removal and Installation

Maintenance:

Oil Change, Filter Replacement, Spark Plug Replacement, Fluid Level Checks and Replenishment, Belt Inspection and Replacement

Troubleshooting:

Systematic Diagnostic Flowcharts, Common Fault Symptom Analysis, Component Testing Procedures

Repair:

Component Removal and Installation, Reassembly Instructions, Torque Specifications for Critical Fasteners

Diagnostics:

On-Board Diagnostics (OBD) Procedures (where applicable for the era), Fault Code Interpretation, Measurement Block Group Analysis

Special Tools:

Identification of required Mercedes-Benz specific tools and their applications

Depth:

Comprehensive from routine maintenance to complete engine and transmission rebuilds, including detailed electrical schematics and diagnostic routines.

📊 Manual Specifications

Format:

Digital Software (Likely PDF or Proprietary Viewer)

Searchability:

Likely searchable text for quick information retrieval

Quality:

Digital reproduction of original factory manual quality

Binding:

Not Applicable (Digital)

Paper:

Not Applicable (Digital)

⚙️ Engine Specifications

Engine Type:

Inline 6-Cylinder, Naturally Aspirated

Displacement:

2.6 Liters (2597 cc)

Bore X Stroke:

82.0 mm x 80.25 mm

Compression Ratio:

9.2:1

Horsepower:

160 hp @ 5800 RPM

Torque:

177 lb-ft @ 4400 RPM

Fuel Delivery:

Bosch KE-Jetronic CIS-E Fuel Injection

Fuel Type:

Unleaded Premium Gasoline (91 Octane Recommended)

Oil Capacity:

6.5 Liters (with filter)

Recommended Oil Viscosity:

SAE 10W-40 (or as per owner's manual based on climate)

🔧 Transmission

Type:

4-Speed Automatic Transmission

Model Designation:

722.424

Manual Transmission Availability:

Not Available for 300TE (estate model typically automatic only)

Shift Modes:

Standard (Drive), 3, 2, 1; 'E'/'S' mode selector (Economy/Standard)

Transmission Fluid Type:

MB-Approval 236.1 Automatic Transmission Fluid (ATF)

Fluid Capacity:

Approximately 7.5 - 8.0 Liters (dry fill)

📐 Dimensions

Length:

4740 mm (186.6 in)

Width:

1740 mm (68.5 in)

Height:

1440 mm (56.7 in)

Wheelbase:

2800 mm (110.2 in)

Front Track:

1487 mm (58.5 in)

Rear Track:

1460 mm (57.5 in)

Cargo Volume:

Approximately 560-1600 Liters (with rear seats folded)

Curb Weight:

Approximately 1620 kg (3571 lbs)

Gross Vehicle Weight:

Approximately 2160 kg (4762 lbs)

Towing Capacity:

Typically rated for 750 kg (1653 lbs) unbraked, 1500 kg (3307 lbs) braked.

🛡️ Safety Features

Crash Test Data:

While formal NHTSA/IIHS ratings for this specific year and model are scarce, the W124 chassis was renowned for its robust 'safety cage' construction and crumple zones, considered very safe for its time.

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Optional Acceleration Skid Control (ASR) on some later W124 models, but unlikely standard on 1990 300TE.

Airbags:

Driver's side airbag typically standard or a very common option by 1990.

Seatbelts:

Pretensioner seatbelts for front occupants.

Structural Design:

Reinforced chassis and doors, energy-absorbing steering column, impact-resistant windows.

💡 Technology Features

Audio System:

Original Becker Grand Prix or similar period-appropriate Mercedes-Benz radio, often with cassette player.

Speakers:

Typically 4 or 6 speaker system.

Cruise Control:

Standard cruise control system.

Climate Control System:

Manual or optional Thermatic automatic climate control.

Connectivity Features:

No modern connectivity features like Bluetooth or USB. Analog systems for audio and communication.

🔧 Maintenance

Oil Change:

Typically every 7,500 - 10,000 miles (12,000 - 15,000 km) or annually, whichever comes first (refer to manual for exact recommendation).

Air Filter Replacement:

Every 15,000 - 30,000 miles (24,000 - 48,000 km)

Fuel Filter Replacement:

Every 30,000 miles (48,000 km)

Spark Plug Replacement:

Bosch W8DC or equivalent; replacement every 30,000 - 40,000 miles (48,000 - 64,000 km)

Transmission Fluid Service:

Every 30,000 - 50,000 miles (48,000 - 80,000 km) or as per manual, including filter replacement.

Coolant:

Mercedes-Benz Genuine Coolant (or equivalent silicate-free antifreeze/coolant) mixed 50/50 with distilled water.

Brake Fluid:

DOT 3 or DOT 4 approved brake fluid.

Wiring Harness:

Degradation of the main engine wiring harness insulation (known as 'chickened wire') is a common issue over time, leading to intermittent electrical problems.

Fuel Economy:

While generally robust, fuel economy can be impacted by wear in the K-Jetronic system components or incorrect tuning.

Vacuum Lines:

Cracked or leaking vacuum lines can cause idle issues, poor performance, and affect climate control operation.

Suspension Bushings:

Wear in suspension bushings (control arm, sway bar) can lead to noise, poor handling, and premature tire wear.

Window Regulators:

Power window regulators can become weak or fail over time.

📚 Vehicle History

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, safety, and durability, established over decades.

W124 Generation:

The W124 generation (1984-1995) is considered one of Mercedes-Benz's finest designs, emphasizing robust engineering and build quality. The 300TE variant offered practicality and luxury in the estate format.

Production Period:

The W124 range was produced from 1984 to 1995, with the 300TE model being a significant part of the lineup throughout this period.

Manufacturing Location:

Primarily manufactured in Germany.

🏆 Awards & Recognition

General Reputation:

The W124 series is widely regarded as one of the most reliable and well-engineered Mercedes-Benz models ever produced, often cited in automotive enthusiast circles for its longevity and build quality. While specific awards for the '1990 300TE' are uncommon, the overall W124 platform received consistent praise for its design, comfort, and durability.