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Q: there is a suction through oil cap. when it is on the engine makes a high pitch. on 2009 Volvo C70

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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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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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