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1998, F-150, suspected head gasket issue, water in oil, is there a temporary solution?

Noticed light chocolate colored oil on surface of oil cap. similiar to a milkshake.

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  • Cars & Trucks Expert
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No fixes for a compression leak.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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SOURCE: Low coolant

"I assume the chocolate color is an indication of maybe not water leaking into the oil?"
I'll lay $5 on it's being coolant :-)

As for the "overflow cap" or expansion tank filler cap as I would call it, in the absence of a VW engineer telling you different, I would leave it loose while the Stop Leak was taking effect, just to avoid forcing the Stop Leak into the oil system as the coolant system pressurised. If the can says "...works in ten minutes" then you could tighten it after that time.

Be sure to check the coolant level soon afterwards to find out if it has worked.

If the Stop Leak doesn't... I'd recommend getting a mechanic to find the leak and fix it. Left to themselves, things go from bad to worse.

Good Luck, D.

Posted on Jun 30, 2008

  • 2 Answers

SOURCE: Head Gasket?

an emulsion build up on the cap can only be caused by water. the question is how the water is getting in, mostly likely head gasket. are you having to top up your cooling a lot?

Posted on Oct 05, 2008

  • 6982 Answers

SOURCE: Coolant turned into foamy grey gunky milkshake, oil level is low

If forced to guess, I'd have to say head gasket...but, could be cracked head also (can't really tell unless you tear it down, but to do the repair, either way that's what you need to do.) If residue was reddish, it could be the trans cooler in the radiator but it's not, so rule out radiator. Make sure you flush out system and change hoses during job ... oil softens them and makes them prone to failure. Even if head does not appear to be cracked, have it checked for warpage, sometimes they twist when overheated. Cracked blocks are rare...I would not be concerned unless engine was frozen during winter.

Posted on Apr 15, 2009

rockitman187
  • 2559 Answers

SOURCE: Engine oil moisture

Known issues or not,It sounds like the head gasket is blown,or it has a cracked head.If it was water it would be thick and light grey in color on the dip stick,But yellow indicates antifreeze leak that has not had time to mix with the oil.

Posted on May 20, 2009

jentabby
  • 1 Answer

SOURCE: saturn sc1, oil leaking into antifreeze

We just went through the same thing on our 1997 SC1, replaced the head gasket and the oil in the coolant issue persisted.

Pulled a cylinder head out of a 1995 wagon and put it in, the problem has cleared up after a LOT of flushing with powered automatic dishwasher machine detergent and water. We also replaced the upper and lower radiator hoses, thermostat and water pump once the flushings were complete.


Posted on Jun 19, 2009

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1999 chevy luminapassed smog with flying colors nothing wrong went to change oil it was like a light chocolate color


What is wrong with the oil?

If it looks like chocolate milk then you will have a leak in the cooling system that is allowing coolant to escape into the oil. If your cracked radiator has been replaced and you check the coolant level you will find you will need to top it up.
(Take off the radiator cap when the engine is cold and you might also find evidence of oil that has escaped into the coolant and has attached itself to the radiator cap and the neck of the filler)..

White smoke generally occurs when coolant escapes directly into the combustion chamber not when it escapes into the oil passages in the engine and contaminates the oil.

What you need to track down now is where the coolant is getting into the engine oil which may be through a blown head gasket or a cracked cylinder head or both. If you had a crack in the radiator when driving the car the coolant will escape very fast because it is under pressure. Overheating the engine even for a short while can be enough to cause damage and heating up the engine is unavoidable unless you pick up the coolant leak very quickly.

The first thing I would be doing is to check for a failed cylinder head gasket because I would want to eliminate that as the issue if it has not failed.

In some engine designs coolant can leak into the oil via a failed intake manifold gasket and in that event it is a much simpler repair. I am not sure if that can be an issue in the engine you have fitted in your car but it is something you should check out..

In any event there is a very good video here on ways to identify if you have a blown head gasket. If you do not then you will most likely not have cracks in the cylinder heads either. But one way or the other you need to track down the internal coolant leak as engine oil contaminated with coolant will cause engine damage if not dealt with and the problem repaired..


12 Ways of How To Test Blown Head Gasket Compared PART1


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1 Answer

1985 Sentra, car is getting hot...changed thermostat, water pump, radiator cap...HELP car is still getting hot!


Check the dipstick and underside of oil filler cap for signs of oil/coolant mixture(chocolate milk).If so, bad news, you have signs of a blown head gasket. Also make sure your radiator isn't plugged. You can check this by running your hand along the surface of the radiator when warm, with the engine off of course. You should not feel any cold spots. I'm assuming your cooling fan(s) are working.

Apr 30, 2014 | 1985 Nissan Sentra 2 Door

1 Answer

I was told there was a milky film around my oil cap he thought it could be a blown casket


Sometimes condensation will build up on your oil cap...So a milky substance on your cap doesn't necessarily mean you have a blown head gasket. Check your dipstick to see if it looks like chocolate milk. If it does, then you might have a cracked block or head gasket issue.

Feb 11, 2014 | 2006 GMC Canyon

1 Answer

Car overheated today and began to spill oil. now that I've put water and new oil it doesn't leak but the car shakes when I put it in drive


have you checked the compression on all cylinders?;if two adjacent cylinders are in low range,you may have head gasket damaged. Did you notice oil mixed with vapor on the radiatior cap,oil in the radiator/crankcase (oil looks like chocolate color 'cause of oil/water mixed). Do your spark plugs look like they've been steam cleaned?(from steam in the cylinder head)

Aug 03, 2013 | 1996 Jeep Grand Cherokee

1 Answer

1998 1.4 polo running fine but a bit creamy inside oil filler cap, is this sign of head gasket going?


Normally your oil will have a light chocolate color to it and this usally indicates a busted head gasket or cracked head if you are only seeing it inside the oil cap I wouldnt suspect it I have seen oil caps that develope this light chocolate or creamy color on the underside of them and can only attribute it to condensation being built up on the underside of the cap mixing with whatever little oil is on the cap usally changing the cap takes care of this I hope this helps you in some way.

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1999 f250 super duty building pressure in degas


check ur oil if color of grayish chocolate milk and or white smoke from tailpipe pretty sure signs of blown head gasket

Oct 14, 2009 | 1999 Ford F250 Regular Cab

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Engine oil moisture


Known issues or not,It sounds like the head gasket is blown,or it has a cracked head.If it was water it would be thick and light grey in color on the dip stick,But yellow indicates antifreeze leak that has not had time to mix with the oil.

May 20, 2009 | 1998 BMW 3 Series

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Need to know if light brown oil on oil cap means gasket problem


most likely is condensation in the oil because if you changed your oil and your head was bad you would see it in the oil going into the container. i would not be to concerned .with problem

Mar 02, 2009 | 2003 Audi A6

1 Answer

Low coolant


"I assume the chocolate color is an indication of maybe not water leaking into the oil?"
I'll lay $5 on it's being coolant :-)

As for the "overflow cap" or expansion tank filler cap as I would call it, in the absence of a VW engineer telling you different, I would leave it loose while the Stop Leak was taking effect, just to avoid forcing the Stop Leak into the oil system as the coolant system pressurised. If the can says "...works in ten minutes" then you could tighten it after that time.

Be sure to check the coolant level soon afterwards to find out if it has worked.

If the Stop Leak doesn't... I'd recommend getting a mechanic to find the leak and fix it. Left to themselves, things go from bad to worse.

Good Luck, D.

Jun 30, 2008 | 2003 Volkswagen New Beetle Convertible

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