I am experiencing, now that it is cold in the mornings, a whining noise when I turn the steering wheel for about a couple of minutes until the motor warms up. Can someone tell me where the power steering pump reservoir is? Where they normally are on other cars, there is nothing. I have a 90 420sel(w126). There is a reservoir in front of the driver at the steering column. It states to use dot 4 fluid. Is this it or is this break fluid. This is my first Benz and I am used to seeing a break fluid reservoir and a power steering reservoir. On my car, I only see one. Any help would be appreciated. Thanks