Just changed the manual transmission fluid in my 2003 R53 Cooper S, 73,000 miles. I don't know if it was ever changed because I bought the car for 71,000. But the drained oil is very dark. I used the brand shown in the photo which meets all Mini, 75w-80, GL-4 and MTF 94 specs. If you've ever worked with cars, this isn't very difficult. I plan to redo it in 100k.
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