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In the January 2019 issue of Roundel [monthly magazine from BMWCCA] the technical editor posted this warning:
"NOTE FROM TECH TALK: N54 ENGINES
There are rare but costly occasions of poly-ribbed belt-tensioner failure leading to front crankshaft-seal damage. Replace poly-ribbed belts and their tensioners preventively every 60,000 miles."
Now the editor is saying that the tensioner fails causing the belt to break. I think, as do others here in this thread, that the leaking OFHG leaks so much oil onto the belt that it breaks.
Whomever was doing oil changes on OP car, should have advised the owner of the leaking OFHG. Affects N52 as well. I recently pulled off an alternator from a E90 [N52] and the alternator was completely covered in oil.
I've seen this time and again. People who own BMWs and don't take them to the dealer or a good indy who knows these cars well.
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