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Old 02-01-2011, 02:24 PM   #2
dbworld4k's Avatar
Join Date: Aug 2006
Location: YYZ
Posts: 7,968
Build up due to moisture. Just drive the car hard every now and then and it should be fine. My father's 330 had similar gunk developing under the cap attributed to the short leisurely commute that wouldn't even fully warm up the temp.
'12 M3 6MT Alpine White + Fox Red Extended | '09 328i 6MT Space Gray + Saddle Brown

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