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Jack, the intercoolers are a culprit for leaks on top of the engine. If it is letting by, it is going to be obvious with dirty oil showing you exactly where the leak is.
My thoughts are checking again that glow plug seal under the throttle body is ok. The last one at the back of the rocker cover.
You'll have to remove the throttle body to get to it but I'm betting that could be a possible cause for the oil in the area you're talking about. It is a lot of oil, but as it comes out in a fine mist under pressure it can go everywhere with no obvious point of exit.
You can clean that throttle body out while it's off as well!
Just an idea...
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