Question about 1995 Volvo 850

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What causes an oil blowback from oil cap in my 95,850 volvo

Oil blow back from oil cap

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Clogged oil trap (PCV system, positive crank case ventilation). The hoses and oil trap need to be replaced (due to become brittle, dry rotted, and clogged) as well as cleaning out the sludge in the bottom of the engine block. The parts cost about $150 last I checked, and you will need to remove the intake manifold and spark plug wire cover to access the hoses and oil trap. On the bottom of the trap it connects to the engine block where you have to clean out the oil sludge. If you do not clean out the oil sludge it will still create back pressure through the oil cap and dip stick. I actually did an oil change at the same time, and drained the oil first and left the drain plug out while. I sprayed Sea Foam and compressed air down there to get the sludge out. I also used a coat hanger and brush to scrape/scrub it out. Worked good.

Posted on May 09, 2017

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SOURCE: volvo 960 estate blowing oil from the oil filler

Your PCV / Oil trap is likely clogged. I have had some luck running Mobile 1 Synthetic oil and half a can of seafoam in the engine oil to clean things up but it is likely that you will have to replace the pcv system.

Posted on Mar 16, 2010

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1 Answer

How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

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High presser in tappit cover volvo 84 gl



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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Ok 88 4.0 blow back. Cleaned up motor changed oil pan and valve cover gaskets. Changed front and back vacume harness and CCV still blowing back. What could cause this? Oil psi runs 40 at start up...


Blowby is compression leaking past the rings. The PCV can only handle so much and then you get blowby. Probably just a worn out engine.

Aug 19, 2013 | Cars & Trucks

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My 97 accord lx has a slight oil leak but the oil level us still fine. What could it be?


are you sure it is oil...could possibly be power steering or trans leak...or could be a slight leak at the rear main seal...have it checked for any blowback...or maybe its just over full which can cause a seal to blow out...let me know if any of this has helped

Jul 11, 2013 | Cars & Trucks

1 Answer

I just bought a 94 940 turbo 132 K miles.runs greatit sat for 4yrs!But aftre the oil was changed it started to smoke alotit also has alot of back presure. Also has alot of smoke coming out of oil filler...


yes,volvo,s have a problem with this,remove clean and reinstall the pcv filter or replace it,excessive crank case pressure can allso lead to blowing engine seals and gaskets.

May 14, 2010 | 1994 Volvo 940

1 Answer

Volvo 960 estate blowing oil from the oil filler cap Whats causing it?


Your PCV / Oil trap is likely clogged. I have had some luck running Mobile 1 Synthetic oil and half a can of seafoam in the engine oil to clean things up but it is likely that you will have to replace the pcv system.

Mar 11, 2010 | 1995 Volvo 960

5 Answers

Oil coming out of engine oil filler cap even though i have changed oil filler cap


The engine breather pipe seems to be blocked.
It may also damage the oil seals.

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1 Answer

Oil in the intake manifold air hose...


This is usually an indication of "blowback" caused by worn piston rings. How many miles on the engine? There is not a cheap solution if it is blowback.

Apr 28, 2009 | 2003 Volkswagen Passat

1 Answer

1993 4g37 blowing oil back through intake. Replaced PVC. Only will crank by opening the air filter container and still lots of blow by.


this is actually very common in fact if you own an eclipse that doesnt have atleast some blowback i would be amazed unlees it causes issues with the functionality of the enigne running i would recomend just keep an eye on ur oil and dont fix it unless it is an absolute must because on these cars you can never fix just one issue and you wouldnt want to cause more problems by trying to fix one that isnt really a big deal

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1 Answer

Oil blowing out of the fill cap


u need to verify the Positive Crankcase Ventilation system is functional, if not u have this crankcase pressure problem.

Feb 09, 2009 | 1994 Volvo 850

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