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Oil problem Oil is spraying from the oil dipstick the pcv valve is not blocked

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Somehow that crankcase is being pressureized. You say the pcv is not blocked, but I would replace and check again. The next step is quite expensive and I would want to rule out that pcv for the 10 bucks that it might cost.

Posted on Jan 14, 2009

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I have oil blowing out of the filler tube when I remove the cap on my 2008 Chevy Colorado what could be the problem


It's most likely due to a clogged PCV valve or clogged/kinked PCV hose. I'll include a video showing PCV system operation.
I've seen this symptom many times on various engines, and the PCV valve was usually clogged/defective. A clogged PCV valve results in crankcase pressure build-up and fumes/oil exiting places on the engine that it shouldn't. A severely clogged PCV often makes oil leak/exit out of the dipstick, even with dipstick in place.
The good news is... if the PCV valve is clogged/defective, the "cure" is a very cheap fix. Usually less than $5.
PCV stands for Positive Crankcase Ventilation, btw.

But note that on some engines (those where the oil filler opening is directly above the rocker arms/valvetrain) it is normal to have a small amount of oil "spray" come out, as the rocker arms are dispersing oil thru their oil passage hole on top.

(Whenever posting vehicle questions, always please add the engine size/type. It helps in more accurate diagnosis.)
Also, please rate via the helpful button if you feel my answer helped you out. Also post back and let me know if this cured it.

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1 Answer

How would a blocked pcv affecr oil leaks


The PCV valve allows crankcase pressure to be vented back into the intake. If it gets plugged, crankcase pressure builds up and has nowhere to go. Oil is going to try and escape any where it can, gaskets are the first place to let oil past them. Another weird thing is the oil dipstick might push itself out.

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Would bad pcv valve cause oil to spray top of engine?


About your question about the pcv YES if the pcv is not working/plugged it will build up presure in the crankcase and it will find a way to relieve itself out the dipstick oil filler spout or any other way it needs to have ventalation as the older cars pre 68 they just had a breather tube on back or left side of engine so in short yes this problem will cause the oil to be sprayed top of engine or any other easy exit it can find so replace pcv and all will be good hopr this helps you

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1 Answer

Oil is spraying out of the oil dipstick


Check the the PCV valve to see if it is clogged.

Jan 14, 2009 | 2000 Volkswagen Beetle

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