Quote:
Originally Posted by kingmonkey8
The diff fluid change is not an easy job. On my car there was no drainage bolt. There is a hole for filling but not for draining. Unless you take the diff out and remove the back panel.
I wouldn't really recommend doing it unless necessary.
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I was able to remove and add ~800 ml fairly easily from my rear diff fill port using a syringe type extraction/filling pump, some silicone tube, and a wire coat hanger cut and placed inside the tube to enable bending/directing the silicone tube. I'm sure with a bit more time/creativity you could get more of the 1.5 L quoted volume out. Getting to the fill port plug out was a bit more of a pain than expected because of some braces and vibration dampers in the way, but nothing too difficult to remove.
The rear diff fluid was noticeably more discolored and burnt smelling than the front diff fluid on my xDrive at ~50k miles, so I'm planning to change it more frequently. (Also because it's not a complete drain.)