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There is a suction through oil cap. when it is on the engine makes a high pitch.

(2009 Volvo C70)
in Ashland, OH on April 16, 2013
when the cap is off the sound stops and there is a suction at the opening from hole where oil goes.
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Popular Answer
on April 16, 2013
Engine breather is stopped up! Pcv system cant pull in fresh air through it.
on April 16, 2013
The suction is normal.
It sounds like the seal in the oil cap is bad. Usually you can replace the O-ring.
If you can't just order a new oil cap, shouldn't be more than 10 bucks.
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