Description
Factory Mercedes R Class R300 CDI BlueEfficiency Workshop Manual (2009–2012)
This official factory workshop manual gives US-based technicians and DIY owners complete repair and service coverage for the Mercedes-Benz R300 CDI BlueEfficiency, built on the W251 platform from 2009 through 2012.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM642 3.0L V6 turbodiesel (BlueEfficiency) — approx. 190 hp / 440 Nm |
| Transmissions | 7G-TRONIC 7-speed automatic |
| Drive | 4MATIC AWD |
| Model Years | 2009–2012 |
| Badge Twins | N/A |
Common R300 CDI Repairs Covered
| System | Procedures |
|---|---|
| OM642 Intake Manifold Swirl Flaps | Removal, inspection, and replacement of plastic swirl flap actuators prone to failure and engine ingestion |
| 7G-TRONIC Transmission | Fluid and filter service, valve body inspection, conductor plate replacement for shift irregularities |
| Air Suspension (AIRMATIC) | Compressor diagnosis, air strut replacement, ride-height sensor calibration |
| EGR & Emissions System | EGR valve cleaning and replacement, DPF regeneration procedures and fault diagnosis |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What are the OM642 swirl flap issues on the R300 CDI and does the manual cover the fix?
The OM642 V6 diesel in the R300 CDI is well known for plastic intake swirl flap actuators that deteriorate over time and can break off into the engine. The manual covers full intake manifold removal, swirl flap inspection, and component replacement with correct torque specifications and reassembly procedures.
What chassis code does this manual cover?
This manual covers the W251 chassis, specifically the facelifted R300 CDI BlueEfficiency variants produced between 2009 and 2012. Both standard and long-wheelbase body configurations are included in the service coverage.
Are wiring diagrams and electrical diagnostics included?
Yes. The manual includes complete electrical system documentation: engine management wiring, BlueEfficiency system circuits, climate control, lighting, central locking, instrument cluster, connector pinouts, wire color codes, and ground point locations for the W251 R300 CDI.
What format is the manual?
This manual is delivered as a PDF file. After purchase you receive instant download access, and the file can be read on any device with a PDF viewer. You may print individual pages or full sections as needed, and your download link is available for life.
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