If it's just a weep then it's extremely unlikely that you'd lose enough transmission fluid such that it could compromise the gearbox.
If BMW won't replace the sump you could ask them, as a gesture of goodwill, to check the transmission fluid level and top it up if necessary. Then just keep an eye on things. If the weep develops into a drip you'll most likely start to notice spotting on your drive (or parking place if you park on the road).
I'd still push BMW for a FOC replacement of the sump though. That's not normal for a young car with low miles.
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Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
Last edited by Watsey; 01-01-2017 at 12:04 PM..
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