If oil is accumulting inside the inetercooler, it means that the turbo-shaft seal is leaking causing oil to by pass in to the intake system, then through to your intercooler. A quick check to see if this is a fault, remove the hose/piping from the turbo the intercooler and place a piece of white paper over the hole at the turbo where the air is dispelled. Run the engine for a few minutes and if you notice any oil occuring/building up on the white papaer, then it is the turbo seal. This method is used on everything from jetskis to dump trucks. If no oil is present then the oil leak will be coming from somewhere else on the engine, and being sucked in through to the top of the intercooler. May have to remove it to see where any other leaks are coming from.
This is a common problem with oil gravitating from oil tank to turbo when at rest. Problem was rectified with 996 bi-turbo by installing non-return valve in oil ine to turbo. There is a kit for approx $US400.00 that can be installed by your mechanic. I had this problem now 100% sorted. Clean turbo with zero smoke burn off after start. Contact Tony Callas at Callas Rennsport, 19080 Hawthorne Blvd, Torrance, CA 90503
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