Hi Guys,

Need your input on this issue. Lately, my 1985 W201 190E 2.0 (Manual Transmission) started to produce a high pitch humming or whining noise whenever I drove the car after leaving it overnight or more than 4-5 hours especially in the mornings.
But what baffles me though is the sound will totally disappear after I travel between 3-5 miles.
I do not think it's the wheel bearings because it only happens at low speeds between 15-25 MPH and no noise at all above that speed.

I have changed both my transmission fluid and diffrential oil using Castrol synthetic Gear Oil. But no improvement at all.

Anyone gone through this before?