This bulletin applies to 2008 Mercedes-Benz models equipped with rack and pinion steering (171, 203, 204, 209, 210, 211, 215, 219, 220 and 221 models).
Mercedes has noted that steering racks have been replaced due to “leaking” at the rack dust cap on top of the control head. The moisture may be caused by sweating due to grease liquefying or a film of grease under the dust cap. Heat from the engine causes some of the grease under the cap to liquify. If a leak is actually present, the area would be wet with droplets present.
Clean the steering gear. Spray or coat the steering gear with a suitable leak detector spray. Warm up the steering assembly by turning the steering wheel lock to lock several times. Check power steering pump reservoir level.