Mercedes-Benz R-Klasse 251 facelift R 350 CDI, 224 PS, 7-speed automatic, all-wheel drive (2007–2010)

Research for this car

• Gearbox guide Mercedes 7G-Tronic (722.9) 7-speed automatic: problems, costs and what to check

  Buy only with fluid records and a clean full-system scan, and avoid any car that has run in limp mode or judders at a steady speed.

Known issues for this car

Before you buy this car

From the gearbox guide

1. Read the shift pressure data with XENTRY or an equal Mercedes scanner. Bad result: pressure deviations above 0.5 bar, or adaptation values above 30 percent. Those point to valve body wear.
2. Read the full gearbox fault memory with a full-system scanner. An engine-only OBD2 reader does not show it. Bad result: speed sensor codes P0717, P0718, P0722 or P0793, or any stored limp mode.
3. Test drive cold and warm, and pull away from a stop. Bad result: stuck in 2nd, slipping between 1st and 2nd, or limp mode at about 48 km/h (30 mph).
4. Hold a steady light throttle at about 60 km/h. Bad result: a shudder or hum. A scanner shows converter slip; 5 to 25 rpm is normal, and above about 80 rpm points to clutch wear.
5. Ask for the fluid invoices and check the fluid. Bad result: no change after about 80,000 km, dark brown or black fluid, a burnt smell, or a fluid other than the one for the build. A wrong fluid can cause code P0741. Red-amber is the correct colour.

Running costs

ADAC figures for 15,000 km a year over 60 months

ADAC versions