Description
Factory Mercedes R Class R300 CDI 4Matic Workshop Manual (2009-2010)
This official factory-level service manual gives American technicians and R-Class owners complete repair authority over the W251 R300 CDI 4Matic — one of Mercedes-Benz’s most distinctive luxury people-movers sold stateside during 2009 and 2010.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM642 3.0L V6 turbocharged common-rail diesel (~190 hp / 440 Nm) |
| Transmissions | 7G-Tronic 7-speed automatic |
| Drive | 4Matic permanent AWD |
| Model Years | 2009–2010 |
| Badge Twins | N/A |
Common R Class Repairs Covered
| System | Procedures |
|---|---|
| OM642 Diesel Swirl Flap Failure | Intake manifold swirl flap actuator removal, inspection, and replacement to prevent engine damage |
| 7G-Tronic Conductor Plate | Valve body conductor plate diagnosis, fluid change, and replacement procedures for shifting faults |
| Air Suspension (AIRMATIC) | Compressor replacement, strut servicing, and ride-height sensor calibration |
| Cooling System | Thermostat housing, coolant hose inspection, and radiator flush intervals for the V6 diesel |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What is the known swirl flap issue on the R300 CDI’s OM642 engine?
The OM642 3.0L V6 diesel used in the R300 CDI has a documented tendency for plastic intake manifold swirl flap actuators to fail and shed debris into the engine. The manual covers full intake manifold removal, swirl flap inspection, and replacement torque specs — critical preventative work for any high-mileage unit.
What chassis code does this manual cover, and are both wheelbase versions included?
This manual covers the W251 chassis in both standard and long-wheelbase (LWB/EWB) configurations. All 4Matic all-wheel-drive body variants built in the 2009–2010 model years are addressed, including left- and right-hand-drive builds.
Does the manual include 7G-Tronic transmission service procedures?
Yes. The 7G-Tronic automatic transmission section covers fluid and filter service, conductor plate (valve body) diagnosis and replacement, transfer case maintenance, and complete 4Matic AWD system procedures including differential fluid intervals.
What format is the manual?
The manual is a fully searchable PDF file. After purchase, download is immediate and the file remains accessible for life via re-download. It is compatible with any PDF reader on Windows, Mac, iOS, or Android — no proprietary software required.
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