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For what it's worth here's the Blackstone report from my 6MT in my 228i that had the "lifetime" BMW fluid in it for 71,321 miles. I changed it out and the diff fluid as well. No drain on the diff was a pain. If you change it out yourself make sure to be careful when you reinstall the rubber shock bumper/limiter bolt on the rear of the diff. Steel bolt/aluminum housing. I almost jacked it up and had to clean the threads up with a tap.
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