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Old 03-13-2015, 04:56 PM   #7
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Join Date: May 2014
Location: S.California
Posts: 2,011
A defective AOS creates an abnormally high vacuum in part of the crankcase ventilation system. This may cause a vacuum leak in tubes/connectors/pipes that may look perfect but have concealed defects. Try the old WD-40 test over the whole AOS system ?
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