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Shot in the dark here: pcv hose connecting from valve cover to oil separator possibly leaking and or internal crack in one of the pcv hoses?
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E90 328xi 6MT | Intake Scoops | K&N + Charcoal Filter Delete | DIY Dinan 3in | 3.25in + 3.5in piping | N54 Manifold | MILVS | Ceramic Coated Headers | Secondary Cat Delete | Xdelete | 3.91 Diffs | 22RPD Tune
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