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Old 12-05-2014, 01:01 PM   #1
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Join Date: Apr 2014
Location: Chicago
Posts: 95
AOS assessment

So I understand an indication of a failing AOS is an increased vacuum in the oil fill tube - how much is okay and how much vacuum is too much? I can easily remove the oil cap when engine is running but you can clearly hear the vacuum and once the cap is off, the cars runs poorly.

How do you determine if the vacuum is too much and indicates a failing AOS?

Thx-
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