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Update
BMWCCA Roundel editor Mike Miller put this "note" in January issue.
"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, another issue can be a badly leaking oil filter housing gasket [OFHG] can leak oil onto the belt causing it to break. This affects N52 engines as well. I recently pulled an alternator off an E90 w/N52 and it was all covered in oil. Now this situation would take a long time to develop and the leaking OFHG would be ignored by whomever is doing oil changes.
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