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      11-20-2012, 06:35 PM   #7
Stohlen
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Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

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2008 BMW 135i  [2.83]
Oil Catch Can. Filters out oil put into the intake by your PCV system. Its there to capture the gas vapors that pass by the piston rings during combustion and compression. During this process a small amount of oil is caught as well and funneled into the intake along with the gas vapors. Usually the oil is too heavy and falls out of the air stream before it makes it into the cylinders and coats your intake with oily crud.