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Originally Posted by Efthreeoh
OP, if your mechanic doesn't understand how to change the rear diff fluid in your car, then take it to a different mechanic who does. Yup, BMWs used to have diff fluid drain plugs when the service interval was 30,000 miles, but fluid specs have changed. Regardless, any decent mechanics shop should have some type of fluid transfer apparatus to suck out the old fluid, and any decent mechanic would know that this is a situation where he needs to use such a device.
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Wow. I would recommend finding another mechanic if he can't figure out how to replace your diff fluid.
On Bmw diff, you drain by suctioning it out of the fill hole then refill with fresh fluid.