DIY: Rear Differential Oil Change

SouthArk370Z

A lot depends on how much and how hard you drive the car. I'm not all that hard on a car, so:
For a new car, I like to do the first diff (and trans) change at about 30,000 miles and every 40,000-60,000 after.
For a used car, I will change all fluids within a few weeks of getting the car. If any fluids look dirty, I will do another change in about a week. And then the same 40k-60k for the diff as above.

If you drive hard or use cheaper lubes, you'll may want to change sooner.

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CrunchyCajun

I changed mine 2 days ago. This time I used Liqui Moly (2048) SAE 75W-90 Fully Synthetic Gear Oil - 1 Liter.

There is a built in tube in the bottle that makes the transfer a lot easier and less messy. 2 of these will be enough and there will be plenty left over in each.

There is a noticeable reduction in the noise, doesn't drive differently as far as I can tell.