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Old 02-01-2011, 01:24 PM   #2
dbworld4k
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Join Date: Aug 2006
Location: YYZ / ORD
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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.
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