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I have a 2005 Cadillac CTS with 7,000 miles on it.
There were no problems with my car until I brought it in to the Cadillac dealer 3 weeks ago to get the oil changed.
Since the oil has been changed, the car now makes a grinding noise when driving at low speeds.
I dropped off the CTS this morning at the dealer I purchased the car from to see if they could find any problems with the car.
The service manager left me a message late this afternoon saying the noise was the rear differential.
How concerned should I be about this?
I have no idea what a rear differential is or what it does.
Thanks for any help.
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