i did on my 1979 320i in the gearbox. It did work really well. I'm not using it on the 325e 'cos it has the green sticker on it and the manual says it uses some special oil, but I'm using it on the diff with very good results, no boiling and no burning. As for the clunk, make sure you check the diff when you do the fluid change, making sure nothing is flying around where it's not supposed to....
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Freude am Fahren forever....
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