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Design Engineer (specifically automotive Lamp design) here...
On the original post, that is indeed an issue. Moisture leaking most-likely, around Lens to HSG, control unit, or vent filter area. May be degradation of anti-fog coating. However, the replacement unit those are just "normal" marks that happen at the supplier BUT are ultimately within "spec" for the customer (BMW). They have standards for what is acceptable as appearance rejects (scratches, scuff marks, dust, etc.). And sometimes the service level parts have less strict standards as well. Personally I wouldn't make a big deal about it (eco-friendly response?), even my M3 has dust and small marks, but I'm not sweating it.
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ZCP - Daily Driven Trackster ~ Gone but not Forgotten
1LE - Track Rubber & Garage Dust Collector
Last edited by OhioRiderAaron; 12-07-2018 at 10:17 AM..
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