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Just serviced my alpina. Wondering if i should drain and refill the gearbox oil. Not sure if i should as it might be oil for life. Any ideas? I guess there is no filter as its manual. Thanks. Paul approx 74000 miles.

YES YOU SHOULD
its a lovely idea " sealed for life" but oil gets old and leaks can appear, so i do yes , in fact i will doing mine and also the back axle very soon.