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Is it metallic or is it a tire scrubbing sideways because it isn't turning enough (ie. one isn't turning as sharply as the other one)?
My W126 300SDL used to do this. I could hear it best in parking garages where the echo would amplify the noise. Turned out a new set of front ball joints fixed it -- one was siezed and the other was loose. Noise went away completely after install of the new joints.
Neal
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