After replacing my "working" original on a '97 with 105K miles I have the same question.
Should there be ANY oil in the vent hose that goes from the AOS to the intake?
By design I would assume the answer is NO, but is there an authoritative source that can confirm this?
If that is the answer, seems a good way of checking the AOS would be to pull the vent line, on the intake side, and look for oil....no?
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