Q: Rear differential maks sound is it too late to change oil ?

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My differentisl starts to make a sound when i go over 60 and the sound raising with the speed. i already cheked the oil level, and it was not full to the Side plug but there is oil in it. Is it too late to change only the oil at this point ? Sould i just add more oil or change it ? What type of oil it need for very hot weather ?

My car has 150000 miles.
My car has an automatic transmission.

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