This comprehensive 2008 Mercedes R-Class (W251) Service and Repair Manual provides you with all the information you need to maintain, service, diagnose and repair your vehicle. This manual is the same one used by Mercedes-Benz technicians at dealerships. It contains detailed, step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications to help you confidently tackle any repair job.

The manual covers all aspects of your R-Class, including:

- **Maintenance:** Routine maintenance procedures, schedules, and specifications
- **Engine:** Detailed information on engine components, operation, diagnostics, and repair.
- **Control System:** Explanation of the vehicle's electronic control systems, including the engine control unit (ECU) and other modules.
- **Mechanical:** In-depth coverage of the drivetrain, including the transmission, axles, suspension, steering, and brakes.
- **Fuel Service Specifications:** Information on fuel systems, fuel injection, and emissions control.
- **Emission Control:** Detailed descriptions of the emissions control system, including catalytic converters, oxygen sensors, and other components.
- **Intake Exhaust Cooling:** Comprehensive information on the intake and exhaust systems, including cooling systems and components.
- **Lube:** Specifications and recommendations for lubricants, fluids, and filters.
- **Ignition Starting Charging:** Detailed explanation of the ignition, starting, and charging systems.
- **Auto Transmission Clutch:** Complete information on the automatic transmission, including clutch operation and repair.
- **Manual Transmission:** Information on manual transmissions, including operation, maintenance, and repairs.
- **Transfer Propeller Shaft:** Detailed coverage of the transfer case, propeller shafts, and related components.
- **Drive Shaft:** Information on drive shafts, including operation, maintenance, and repairs.
- **Differential:** Comprehensive coverage of the differential, including operation, repair, and maintenance.
- **Axle Suspension:** Explanation of the axle and suspension systems, including components, operation, and troubleshooting.
- **Tire & Wheel:** Detailed information on tires, wheels, and wheel alignment.
- **Brake Control:** In-depth coverage of the brake control system, including ABS and other electronic systems.
- **Brake:** Detailed information on the brake system, including components, operation, and repair.
- **Parking Brake:** Explanation of the parking brake system, including operation and adjustments.
- **Steering Column:** Information on the steering column, including operation, maintenance, and repair.
- **Power Steering:** Detailed coverage of the power steering system, including components, operation, and troubleshooting.
- **Air Condition:** Comprehensive information on the air conditioning system, including components, operation, and repair.
- **Suppl Restraint System:** Explanation of the supplemental restraint system (SRS), including airbags and seatbelts.
- **Seat Belt:** Detailed information on seatbelts, including operation, adjustment, and repair.
- **Engine Immobilizer:** Explanation of the engine immobilizer system, including operation and troubleshooting.
- **Cruise Control:** Information on the cruise control system, including operation and repair.
- **Wiper & Washer:** Detailed coverage of the wiper and washer system, including components, operation, and repair.
- **Door Lock:** Comprehensive information on the door lock system, including operation, troubleshooting, and repair.
- **Meter Audio/Visual:** Explanation of the instrument cluster and audio/visual systems, including operation and repair.
- **Horn:** Information on the horn system, including operation and troubleshooting.
- **Windshield/Glass Mirror:** Detailed coverage of the windshield, glass, and mirrors, including installation and repair.
- **Instrument Panel:** Explanation of the instrument panel, including components, operation, and repair.
- **Seat:** Comprehensive information on seats, including operation, adjustment, and repair.
- **Engine Hood/Door:** Detailed information on the engine hood and doors, including operation, adjustment, and repair.
- **Exterior & Interior:** Coverage of the exterior and interior components, including body panels, trim, lights, and upholstery.
- **Electrical:** Complete information on the electrical system, including wiring diagrams, troubleshooting, and repair.
- **Multiplex/Can Communication:** Detailed explanation of the multiplex and CAN communication systems, including operation and troubleshooting.

With this comprehensive manual, you can confidently perform your own repairs and save money on expensive dealership service costs.

The 2008 Mercedes-Benz R-Class (W251) was a groundbreaking model for the German automaker, marking their foray into the burgeoning crossover segment. It challenged conventional automotive norms by offering a blend of luxury, practicality, and versatility unlike any other vehicle in its class. The R-Class was essentially a luxury wagon with SUV-like capabilities, boasting a spacious interior with seating for up to seven passengers, ample cargo space, and a commanding driving position. Its unique design, combining elements of a minivan, station wagon, and SUV, proved to be a polarizing factor for many, but undeniably set it apart in the market.

Under the hood, the R-Class offered a range of powerful and efficient engines, catering to diverse driving needs. Options included V6 and V8 gasoline engines, as well as a V6 diesel engine for superior fuel economy. The R-Class was also recognized for its advanced safety features, including standard Electronic Stability Program (ESP), multiple airbags, and an optional lane departure warning system. Inside, the cabin was a haven of luxury, adorned with premium materials, advanced technology, and a host of comfort features. Despite its unique appeal, the R-Class struggled to find its niche in the market, as buyers gravitated towards more traditional SUVs and minivans. However, it remains a testament to Mercedes-Benz's commitment to innovation and their ambition to redefine the luxury automotive experience.