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Discussion Starter #1
I have 2006 330 CI, should I have slight vacuum when I remove the oil cap? Very slight but there.
 

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ROLL TIDE!
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Very slight is subjective. You should notice a change in idle quality when you do that. If it doesn't have enough vacuum it could be a sign of a failing crank case vent valve (PCV). But it sounds like yours is normal.
 

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Keeping it surreal
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Lay a plastic sandwich baggie over the hole....if it just barely gets sucked in, you`re OK. If it tries to get totally sucked in, you`ve got a problem.
 
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