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If you question BMW's guidance on fluid change intervals, it is fairly cheap (in the order of $25 or so) to get pretty much any fluid tested to see if it is still good or really does need to be replaced. I haven't had my oil tested on my current car, but found that it could safely go MUCH further than my last one's suggested interval. Unless you use your vehicle on the track or lots of short distance with stop and go, or in exceptionally dusty conditions, the large sump (by most brand's norm) and low rpm at cruise, it just doesn't wear the oil out as fast. On my last car, testing also caught an early slow leak of antifreeze into the oil - way before it could start to cause damage. I think it is cheap insurance, and assurance of success or confirmation of your fears.
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