I pulled the motor on my car and lubricated the bearings several times, allowing the oil to soak for a few hours. Next day, wiped off the excess oil on the bearings, and reinstalled it. Started squealing again the next day, then quieted down. Now, I hardly hear any noise.

BUT, because the motor did squeal again, I went ahead and bought a new motor and blower wheels. I'll be replacing the OEM motor sometime in the future.

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My first Mercedes Benz. 4/6/07.

1984 190E (201 024) 2.3L four.