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Automotive fuel system Motor vehicle Car Vehicle Automotive design

Dealer check pointed out oil leak probably from the big O ring connection and sure enough despite looking fine up top it is messy under this connection. This has to be oil mist from a breather system. Is it getting squeezed past the O ring when under high boost pressure? The elbow doesnt look that difficult to take off for a clean up. Just a big jubilee clip on the bottom end towards the intercooler and the large circlip gizmo at the top at the plenum. Plus a sensor and pressure pipe to disconnect. Engine doesnt use oil and otherwise performs fine. Just turned 60k. I noticed similar issues with the X250 arrangement. Sounds like a dirty diesel thing.
 
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