Hmm I wasn't aware that it was caused by bumps, but mine has some light cracking in it like yours, they haven't spread visibly in the past 6 months or so, but next time I take the car in i'll have the techs look at it. A very common issue on our cars, but the kind of annoyance I can live with. Better this go wrong than VANOS or a waterpump.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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