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#2165569 - 02/08/11 08:46 PM White milky goo on inside of filler cap
dsmith41 Offline


Registered: 03/25/08
Posts: 722
Loc: Kansas City Metro
My brother is looking at buying a pickup and I looked at for him. Everything looks good on it except when I looked under the filler cap it had the off-white colored goop on it.

I know condensation is a real possibility but there was a fair amount of it there and I am not sure if it would burn off with a long Interstate run. I saw it after a 10-15 minute test drive with a couple miles at 70 mph. Am I over reacting? My truck never has this, only a clean thin film of oily goodness under the cap.
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2001 Chevy Impala 3800
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#2165573 - 02/08/11 08:51 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
SuperFast Offline


Registered: 01/11/11
Posts: 397
Loc: California
Originally Posted By: dsmith41
My brother is looking at buying a pickup and I looked at for him. Everything looks good on it except when I looked under the filler cap it had the off-white colored goop on it.

I know condensation is a real possibility but there was a fair amount of it there and I am not sure if it would burn off with a long Interstate run. I saw it after a 10-15 minute test drive with a couple miles at 70 mph. Am I over reacting? My truck never has this, only a clean thin film of oily goodness under the cap.


"white milky goo" could be what mechanic types call "mayonnaise," and tht is sign #1 of a blown Head Gasket.

ive had cars w HG going out that hesitated, stumbled on acceleration.. this could be coolant fouling spark

white Plume of candy-smelling smoke, usually very big and doesnt go away in extreme cases = sign #3

pull radiator cap and check for "mustard" = sign #4

loss of coolant could be sign #5

lots and lots of pressure could be sign #6

milkshake looking oil could be sign # 7

how many of these does it have? Mayonnaise on a cap is usualyl never a good thing.

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#2165576 - 02/08/11 08:54 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
JRed Offline


Registered: 06/01/09
Posts: 1633
Loc: Virginia
If there were a lot of that under the cap and down the oil dipstick tube and the oil looked even the slightest bit strange I wouldn't buy it.
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#2165585 - 02/08/11 09:02 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
tig1 Offline


Registered: 01/03/09
Posts: 9497
Loc: Illinois
This is quite common. My sons old Ford Ranger always had that and he just sold it with 354K on the engine. Often you see this with oil fill holes that are evelated well above the valve cover.
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#2165592 - 02/08/11 09:06 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
dsmith41 Offline


Registered: 03/25/08
Posts: 722
Loc: Kansas City Metro
This engine was a 4.0 SOHC in a Ranger which is the same as my truck that has never had any sign of "mayonnaise."
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1995 Ford Ranger 2.3L
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#2165597 - 02/08/11 09:09 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
ABerns Offline


Registered: 08/11/10
Posts: 407
Loc: Iowa
Goo could mean a blown head gasket, as you pointed out. On a lot of vehicles, though, the fill cap simply doesn't get hot enough, as tig1 had said. If it's farther away from the engine (farther away as in not right there), it can stay a little cooler and cause this condensation.

However, you said it's the same engine as your Ranger, and if in fact it is, and the fill cap is in the same place, then I don't know. I'd check the dipstick - it should give you a little better thought about what's going on, I think. Goo on the dipstick after the run = bad news.

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#2165599 - 02/08/11 09:14 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
hisilver Offline


Registered: 03/08/10
Posts: 530
Loc: NC
Im gonna say its normal. I get that in the winter on my truck and wont "burn off" with less than a 40 minute drive.

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#2165619 - 02/08/11 09:35 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
beast3300 Offline


Registered: 12/24/09
Posts: 2921
Loc: Ohio
Ford + winter = white goo undercap. (usually)

Like Tig said, the cap is raised from the valve cover.
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#2165621 - 02/08/11 09:37 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
justinf89 Offline


Registered: 07/11/10
Posts: 532
Loc: Hampton, VA
I guess its bad that I have sign 4 5 and 6 in my safari..
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#2165629 - 02/08/11 09:45 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
bepperb Offline


Registered: 01/10/08
Posts: 4554
Loc: Milwaukee, WI
I saw it on our Civic shortly after we got it. 50,000 miles later it never came back and we never had a problem. I'd be skeptical, but the vehicle may have sat for some time for some reason.
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#2165660 - 02/08/11 10:28 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
stephen9666 Offline


Registered: 12/08/06
Posts: 2327
Loc: USA
I once noticed yellow milky goo under the oil cap on my GF's VW Beetle. I panicked, thinking it was a blown head gasket. A quick google search showed that it is common on these cars and not a problem.

Like others have said, some cars just do this. But, find out if yours is one of the models where it is common.
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#2165680 - 02/08/11 10:57 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
dtt004 Offline


Registered: 08/13/10
Posts: 314
Loc: Orange County, CA
Hi.

The white milky stuff is not due to an elevated oil cap or whatever. That's impossible. Ambient temperatures underneath the hood, combined with energy released from the combustion rxn, ensure that everything is hot enough that condensation will not form in large enough quantities to cause "goo."

Cars that have it, and the forums + owners say that "oh it's a common problem"...that's the manufacturer's engineering fault. Think about it. That stuff wrecks the engine. Would any manufacturer in its right mind want to design something like that? No. It's an engineering or assembly problem.

A blown head gasket is a more plausible problem. Because it contains water, and has a hydrophilic chemistry, it naturally has a lower boiling point and vaporization point. So, moisture builds up underneath during normal operation of the vehicle. That moisture collects at the top and combines with impurities to produce that "goo." Chances are, you will also find it on the top of the valve cover too.

The engine also could be operating in extreme conditions or in an area with high moisture content.
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#2165700 - 02/08/11 11:27 PM Re: White milky goo on inside of filler cap [Re: dtt004]
Nick R Offline


Registered: 07/14/09
Posts: 10275
Loc: Saratoga, NY
Originally Posted By: dtt004
Hi.

The white milky stuff is not due to an elevated oil cap or whatever. That's impossible. Ambient temperatures underneath the hood, combined with energy released from the combustion rxn, ensure that everything is hot enough that condensation will not form in large enough quantities to cause "goo."

Cars that have it, and the forums + owners say that "oh it's a common problem"...that's the manufacturer's engineering fault. Think about it. That stuff wrecks the engine. Would any manufacturer in its right mind want to design something like that? No. It's an engineering or assembly problem.

A blown head gasket is a more plausible problem. Because it contains water, and has a hydrophilic chemistry, it naturally has a lower boiling point and vaporization point. So, moisture builds up underneath during normal operation of the vehicle. That moisture collects at the top and combines with impurities to produce that "goo." Chances are, you will also find it on the top of the valve cover too.

The engine also could be operating in extreme conditions or in an area with high moisture content.


I'm sorry chief, but you are completely wrong. It IS caused by an elevated oil cap. I've seen it in several different Ford Modular v8s which I know for a FACT don't have blow headgaskets. Our own 4.6L for example has had it every winter for as long as I can remember. The underside of the filler cap is cool enough to cause condensation. When at speed, or idling, underhood temperatures in winter aren't reallly all that high.
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11 Chevy Cruze 1.4T/26k

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#2165709 - 02/08/11 11:40 PM Re: White milky goo on inside of filler cap [Re: dtt004]
tinmanSC Offline


Registered: 09/07/10
Posts: 1825
Loc: Oswego, IL
Originally Posted By: dtt004
Hi.

The white milky stuff is not due to an elevated oil cap or whatever. That's impossible.


This information is incorrect. This does happen on some models of engine in the winter. My neighbor has a dodge Durango that has a plastic oil fill cap away from the rest of the engine. In the winter is gets this goo on it also, but only in the winter.
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#2165721 - 02/08/11 11:50 PM Re: White milky goo on inside of filler cap [Re: dsmith41]
goodtimes Offline


Registered: 12/08/10
Posts: 285
Loc: california
We have one car that has it, using M1 oil, because it is driven on very short trips almost all the time. Especially now in colder moist weather. It doesn't mean the head gasket has to be leaking.

I would go so far as to say every IC engine will develop this water oil mix goo under the right conditions, not some, all will, yours will. Maybe not seen under the only opening we see, the oil cap, but it will be in there. To me, that's why the one size fits all oil change interval, like Toyota's 10k for example, is faulty advice. hornets

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