Question about 1998 Volvo S70

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Pressure is building up in engine and causing oil to blow out the filler cap. why is this

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Positive Crankcase Ventilation has been used for decades and uses a valve (PCV) to route oil fumes and any pressure due to blowby back into the intake system to be mixed with fuel and somewhat burned during combustion. I'd guess you need to have the PCV and possibly the hoses connecting it replaced.

Posted on Aug 02, 2009

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You need to check engine breather pipes these are common for clogging up

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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I have a bmw 330i 2006 and i have oil coming out of the oil filler cap thats on top of the engine what could be the problem because the cap it self looks fine and tight


You may be having problems with the crankcase pressure regulating valve (PCV). If this is clogged or malfunctioning, pressure can build up inside the engine and blow oil out the filler tube.

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Check your PCV valve. Its the device that provides ventilation to the crankcase and valve covers. If its clogged or non functional it will cause the engine to **** or blow air from an area with less resistance, which is probably the filler cap. As its blowing air out of the engine it will shoot a little bit of oil with it

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What will cause a blow back


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I doubt the oil is boiling in the sump or your engine would show signs of over heating. Change the PCV valve in the valve cover as it may be stuck closed causing internal pressure to build up and escape through the filler cap.

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The oil level may be too high.
Is the filler cap tight?
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A bad had gasket. Engine will be over heating as water is being used up during combustion.
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Make sure your PCV is not restricted causing pressure to build up in your crank case. thts what this sounds like. somethign is causing you to build up pressure.

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Engine blowing oil from oil filler cap


I had the same problem. I changed the pcv valve and checked the hose. It still did the same thing. Then I checked the metal tubing that the hose connects to and found it was full of hardened gunk. I sprayed PB Blaster into the tube let it soak for awhile. Then took an old choke cable, put it on a drill and ran it into the tube like a drain snake. It took a while of doing this over and over but eventually got it cleared out. Now, no more oil all over the engine and hood compartment.  

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