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Changed my oil today.When I took the cap off to replace the oil,the cap had some white goo on it.What is this?

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Water contamination. You have coolant mixing with the engine oil. Either someone has put water into the oil by mistake. Or your cylinder head gasket has failed and needs replacing. Head gasket replacement is a medium to big job and will cost a lot. 3 hours labour at an absolute minimum. The cylinder head should be skimmed too make sure it makes a good a seal when the new gasket is fitted. Does the engine overheat? Has the gasket been changed before? There could be condensation from water in the oil system if the gasket was changed by the previous owner.

Posted on Dec 14, 2014

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Moisture. water/coolant is getting into your oil. have it tested to see if you have a bad head gasket.

Posted on Dec 14, 2014

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Could be a leaking cylinder head gasket or a small crack in the cylinder head. Is the head aluminum? Make and mileage of the vehicle will sometime help as some vehicle makes are notorious for head gasket problems. This allows coolant into the oil and causes this goo on the inside of the cap. Have a trustworthy shop check it out to be sure.

Posted on Dec 14, 2014

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Posted on Jan 02, 2017

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SOURCE: Their is a white milky

No, it does not mean you have a head gasket failure. Moisture can build up under the cap and when the moisture mixes with the light oil film, it will appear milky. If there is no evidence of coolant in the oil on the dipstick or evidence of coolant in the oil when it is drained, then there is no reason to believe that there is an internal gasket failure, unless of course, you are overheating or the engine is running a high temp.

Posted on Dec 31, 2010

OneMixDJ
  • 21 Answers

SOURCE: xj40 head gasket

Greetings Operaman,

Unfortunately, the symptoms you describe as known as "gelling" in which the antifreeze seeps into the crankcase, indicating that your head gasket is indeed need of replacement.

I strongly suggest you refrain from driving your car and take it to get fixed. Reason being is because continuing to drive it can likely result in warpage of the head (which sits about the block).

Hope this helps.

Posted on May 18, 2008

robshow
  • 367 Answers

SOURCE: oil cap

Yes this is a potential problem,

1.) moisture from not changing your oil often or car was sitting.
2.) Head gasket is blown causing coolant to blow through into oil.

When you pull dip stick is there white creamy substance on the dipstick

Posted on Jan 14, 2009

  • 106 Answers

SOURCE: 01 pontiac firebird losing coolant fast and white goo on oil cap

Head gasket, or intake manifold gasket is letting coolant leak by, into the engine.

Posted on Jun 09, 2009

  • 21 Answers

SOURCE: yellow white goo under my valve covers but not in the oil

As Roddin1 mentioned it could be a coolant leak, or it could be and hopefully is something less serious. Any chance you live somewhere cold and you don't let your car warm up before driving off? Because if not condensation will build up and cause that yellow/white goo.

Posted on Feb 07, 2010

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2 Answers

Ok,I have a 2002Firebird 3.8 seriesII, V6 coolant/water is coming up from radiator with cap off.


When you change antifreeze an air pocket is created in engine behind thermostat. You must let it run until the thermostat opens. Until then, liquid will boil backfkowing through bottom of radiator.
As for milky look, blown headgasket would cause white foam that if left alone wouldclear up. Otherwise it could be an additive in the fluid such as rust preventative.

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Water in oil


Head gasket can be replaced. If crack in the block it depends on how bad it is, where it is and how much you want to put into it once you find it....if it is there. Discolored oil cap goo can be a hundred things. Have compression checked.

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Its mixing coolant and oil
Stop dirivng it and get the head gasket done.
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Yellow white goo under my valve covers but not in the oil


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01 pontiac firebird losing coolant fast and white goo on oil cap


Head gasket, or intake manifold gasket is letting coolant leak by, into the engine.

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I have a 89 isuzu trooper 2 water pump blew so changed it and now I am over heating fast. Got a new thermostat and rad cap still over heats. Took the return line off at firewall and seen if it was blocked...


If there is no liquid in your oil, or you oil doesn't look white and mucky on your dipstick, you need to replace your radiator. If your oil is white and mucky on the dipstick, you have bad head gaskets.

May 04, 2009 | 1998 Isuzu Trooper

1 Answer

Oil cap


Yes this is a potential problem,

1.) moisture from not changing your oil often or car was sitting.
2.) Head gasket is blown causing coolant to blow through into oil.

When you pull dip stick is there white creamy substance on the dipstick

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