POWER STEERING RESERVOIR LEAK One common problem with mercedes W210, W163, W211 is a leaking power steering reservoir. The most common problem is a O-ring located on the back of the reservoir fluid. This O-ring goes bad due to time, usually after 5 years, dealer may charge $150 for repairing, you can do this for $10 and 45 minute time. So if you are up to it here is how. You will need: Manual Oil drain pump. Screw driver Paper towel, to clean up any spill (you will need this) URO Parts 000 466 1880 Power Steering Reservoir Gasket (you can find these on AMAZON power Sterring ORING Power Steering Reservoir Fluid Optional Power steering fluid CHF 11S Prestone AS268 Mercedes OE 0012403 So these are the steps to follow: Remove engine plastic cover. Drain Power steering fluid from reservoir using manual pump. Carefully unscrew clamp attaching power steering hose to the right bottom of the power steering reservoir. Do this carefully si...