Quote:
Originally Posted by ROLLGUY
At idle, the oil will want to go past the seal and bearings (less resistance than the oil drain), but any added pressure (boost) should cause the oil to take the path of least resistance, being the oil drain.
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Interesting. I wonder what the pressure characteristics are at the shaft. The compressor generates low pressure in the inlet and high pressure at the outlet. The shaft is right in the middle of the involute, which I would expect to be a low pressure area, but I could be wrong.
In this case, it looks as if the oil is coming back through the ARV. I bet if you remove the manifold and air plenum, you would find them drenched with oil, which makes it hard to identify the source.