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If your oil scavenge system is not working properly in evacuating oil from the turbochargers, most of the time it will come out on the turbine side but many, many times, I have seen it come out the compressor side, as well. Just depends on the type of scavenge failure. From what you have said, If you had a pump failure, even for 1 minute, I believe this best explains the oil in the intercooler. However, it could have also come from the PCV system, over time, depending on the design and system efficiency. I have seen both problems, oil pump scavenge issues explaining most of the instances of oil in the intercooler. You definitely want to determine where it came from and correct it. MAF sensors really hate oil and will upset a tune in a heartbeat. That is why I have always recommended drilling that .040 hole in the bottom of the outlet of the intercooler. If you ever see residual oil at the hole, or trailing from it, you know for sure something is wrong. Oil should NEVER come out the hole, only a bit of water which leaves no trail. Hope this explanation helps.
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