2009 Volvo C70 Q&A
2009 Volvo C70 Question: there is a suction through oil cap. when it is on the engine makes a high pitch.
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. - bavarican
Engine breather is stopped up! Pcv system cant pull in fresh air through it. - pushrod