🏷️ Basic Information

Make:

Mercedes-Benz

Model:

G-Class

Model Code:

W463

Year:

2008

Generation Code:

W463 (Second Generation)

Chassis Code:

W463

👋 Introduction

Market Position:

The 2008 Mercedes-Benz G-Class (W463) occupies a niche as a luxury off-road vehicle with a strong heritage of ruggedness and off-road capability, blended with Mercedes-Benz's hallmark luxury and engineering.

Competitive Analysis:

Competitors typically include other high-end SUVs with off-road pretensions, though few match the G-Class's long-standing utilitarian roots combined with premium appointments. Its direct competition is often limited to specialized off-road vehicles or ultra-luxury SUVs that may not possess the same level of inherent off-road prowess.

Key Features:

Iconic boxy design, permanent four-wheel drive, three locking differentials, robust body-on-frame construction, luxurious interior appointments, powerful engine options.

Manual Type Clarification:

This is a factory-equivalent service and repair manual, providing the same level of detail and accuracy as used by authorized Mercedes-Benz technicians.

Value Proposition:

This manual empowers owners and independent workshops with the same factory-authorized information used by dealerships, enabling accurate and efficient maintenance and repair, potentially saving significant costs compared to dealership labor rates.

📋 Manual Details

Coverage Areas:

All models and all repairs A-Z

Page Count:

Not Specified (Comprehensive)

Manual Type:

Service and Repair Manual

Language:

English

Format:

PDF

Operating Systems Compatibility:

Windows Vista (32/64-bit), XP, ME, 98, NT, 2000, and Mac compatible.

Software Requirements:

Adobe PDF Reader and Winzip (or equivalent decompression software).

Download Speed:

Indicated as 'Speed Download'.

📖 Manual Coverage

Systems Covered:

Maintenance, Engine, Control System, Mechanical, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging, Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension, Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering, Air Condition, Supplemental Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/Door, Exterior & Interior, Electrical, Multiplex/CAN Communication.

Engine Mechanical:

Detailed information on engine assembly, disassembly, internal components, timing, valve operation, lubrication system, cooling system, and exhaust system.

Engine Control:

Engine control unit (ECU) diagnostics, sensor identification and testing, actuator testing, fuel injection control, ignition timing control, emission control systems, diagnostic trouble codes (DTCs).

Transmission Auto:

Automatic transmission service, repair, overhaul, torque converter, hydraulic control, electronic control of transmission, fluid replacement.

Drivetrain:

Transfer case service and repair, propeller shafts, universal joints, drive shafts, front and rear differentials, axle components, wheel bearings.

Suspension Steering:

Front and rear suspension components, shock absorbers, springs, control arms, bushings, steering system diagnosis, power steering pump and rack service, steering column components.

Brakes:

Brake system diagnosis, disc brake service (calipers, rotors, pads), drum brake service (if applicable), ABS system components and diagnosis, brake fluid replacement and bleeding procedures, parking brake system.

Electrical Systems:

Comprehensive wiring schematics, component location diagrams, fuse and relay identification, charging system (alternator, battery), starting system (starter motor), lighting system, wiper and washer system, power windows, central locking, instrument cluster, audio system, HVAC controls.

Climate Control:

Air conditioning system service, refrigerant handling (safety precautions), compressor, condenser, evaporator, blower motor, cabin air filter, climate control unit diagnosis.

Multiplex Can Communication:

Details on the CAN (Controller Area Network) bus system, multiplexed communication between ECUs, network diagnostics.

Procedures Included:

Complete step-by-step instructions, diagnosis, service, maintenance, repair, troubleshooting, wiring schematics, diagrams, illustrations.

Diagnostic Procedures:

Systematic diagnostic workflows for common and complex issues, troubleshooting trees based on symptoms, use of diagnostic scan tools.

Torque Specifications:

Detailed torque values for all critical fasteners across engine, transmission, chassis, and body components.

Rebuilding Procedures:

Complete instructions for overhauling engines, transmissions, differentials, and other major mechanical assemblies.

Special Tools:

Identification and usage instructions for specialized tools required for specific repair procedures on the G-Class.

Technical Depth:

Factory-level, vehicle-specific, detailed technical data used by dealership technicians.

Schematics Detail:

Extremely detailed wiring schematics for all electrical systems, including power distribution, signal routing, and component interconnections.

Supplemental Restraint:

Airbag system components, diagnostic procedures, seat belt mechanisms, SRS control module.

Body Interior Coverage:

Door mechanisms, hinges, locks, handles, window regulators, seat adjustments, interior trim removal and installation, hood and tailgate operation.

Body Exterior Coverage:

Body panel removal and installation, bumper components, lighting units, glass and mirror replacement, exterior trim.

📊 Manual Specifications

File Format:

PDF

Searchability:

Likely searchable text within the PDF, allowing for quick keyword-based information retrieval.

Print Options:

Allows users to print specific pages or diagrams as needed.

Print Quality:

High-resolution, printable pages, zoomable images.

Binding Type:

Digital (no physical binding)

Paper Type:

Not Applicable (Digital Format)

⚙️ Engine Specifications

Primary Engine:

For the 2008 model year, the G-Class was typically offered with a V8 gasoline engine, most commonly the 5.5L M273 V8. Diesel options were also prevalent in certain markets, such as the 3.0L OM642 V6 turbodiesel.

Engine Performance 5.5L V8:

Approx. 382 hp @ 6000 rpm and 404 lb-ft @ 2800-4800 rpm (figures may vary slightly by specific G55 AMG designation).

Fuel System:

Multi-point fuel injection (MPI) or direct fuel injection (DFI) depending on specific engine variant. Premium unleaded gasoline is typically recommended for gasoline engines.

Common Engine Codes:

M273 (5.5L V8 gasoline), OM642 (3.0L V6 turbodiesel) - specific engines vary by market and trim.

🔧 Transmission

Standard Transmission:

For 2008, most G-Class models featured a 7-speed automatic transmission (7G-TRONIC). A permanent all-wheel-drive system with a 2-speed transfer case and center, rear, and front differential locks is standard.

Optional Transmission:

No manual transmission option was typically available for the 2008 G-Class in major markets. All models were equipped with an automatic transmission.

Transmission Features:

7G-TRONIC, adaptive shift logic, manual mode (Tiptronic), lockable differentials.

Transmission Gear Ratios:

Specific gear ratios for the 7G-TRONIC transmission are detailed within the manual, crucial for accurate repair and diagnostics.

📐 Dimensions

Exterior Dimensions L X W X H:

Approx. 189.1 x 72.2 x 76.1 inches (4803 x 1833 x 1934 mm) for standard wheelbase. (Note: Specific dimensions can vary slightly based on model and options).

Curb Weight:

Approx. 5,300 - 5,600 lbs (2400 - 2540 kg), depending on engine and equipment.

Wheelbase:

Typically around 112.4 inches (2855 mm) for standard models.

🛡️ Safety Features

Safety Ratings:

Vehicle safety ratings from government bodies like NHTSA or IIHS are not as comprehensively documented for older G-Class models as for modern vehicles due to the vehicle's niche and design philosophy. However, standard safety features of the era were incorporated.

Active Safety Features:

Anti-lock Braking System (ABS), Electronic Stability Program (ESP), Traction Control System (TCS), all-wheel drive with lockable differentials.

Passive Safety Features:

Front airbags, side airbags, seatbelt pre-tensioners, reinforced chassis, side-impact protection beams.

💡 Technology Features

Infotainment System:

COMAND (Cockpit Management and Navigation) system, typically including a central display for navigation, audio, climate control, and vehicle settings. CD changer, optional Harman Kardon sound system.

Driver Assistance Features:

While not as advanced as modern systems, the 2008 G-Class featured ESP, cruise control, and parking sensors (optional). Its core off-road systems (locking differentials) are its primary 'assistance' for challenging terrain.

Connectivity Features:

Basic Bluetooth connectivity for hands-free calling may have been available as an option. Aux input for audio.

🔧 Maintenance

Service Intervals General:

Typical oil change intervals are around 10,000 miles or 1 year, whichever comes first. More comprehensive inspections and service are generally recommended at 30,000, 60,000, and 100,000-mile intervals, covering fluids, filters, belts, brakes, and suspension components. (Consult manual for precise intervals based on driving conditions).

Engine Oil Specification:

MB 229.5 (for gasoline engines), MB 229.51 or MB 228.51 (for diesel engines). Viscosity typically 0W-40 or 5W-40, depending on climate and specific engine. Automatic transmission fluid (ATF) specification MB 236.10 or MB 236.12.

Coolant Specification:

Mercedes-Benz approved coolant (e.g., Glycol-based antifreeze with corrosion inhibitors), typically blue or a specific MB approved color.

Brake Fluid Specification:

DOT 4.

Power Steering Fluid:

MB Specification 236.3 or equivalent.

Differential Fluid:

Hypoid gear oil, GL-5 specification, with appropriate viscosity (e.g., 75W-90 or 80W-90) for front, rear, and center differentials.

Common Issues:

Rust around door hinges, tailgate, and spare tire carrier. Issues with door seals and window regulators. Potential for electronic control unit (ECU) glitches. Wear on suspension components due to off-road use. Early signs of aging on aging rubber hoses and belts. Occasional issues with the COMAND infotainment system.

Engine Specific Concerns:

For V8 engines, potential for intake manifold leaks or sensor failures. For OM642 diesel, issues with the Diesel Particulate Filter (DPF) regeneration or glow plug system may arise.

Transmission Specific Concerns:

While robust, the 7G-TRONIC can experience occasional solenoid issues or torque converter problems with high mileage, especially if fluid services are neglected.

📚 Vehicle History

Brand Heritage:

Mercedes-Benz has a long history of producing robust, utilitarian vehicles for military and civilian use. The G-Class lineage dates back to the 1970s, initially developed as a military vehicle, which informs its enduring design and capability.

Model Evolution:

The W463 generation, introduced in 1990, marked a significant shift towards luxury and comfort while retaining core off-road architecture. The 2008 model represents a refinement of this generation, with updated engines, transmissions, and interior features.

Production Locations:

The G-Class has primarily been manufactured in Graz, Austria, by Magna Steyr under contract for Mercedes-Benz.

Model Lineage Predecessors:

The W463 is a direct descendant of the original W460/W461 G-Wagen, maintaining its core off-road identity.

🏆 Awards & Recognition

Recognitions:

The G-Class as a model line has consistently received accolades for its off-road prowess and its unique blend of luxury and capability. While specific awards for the 2008 model might be less publicized than for newer iterations, its reputation for durability and all-terrain performance is well-established.