Took oil cap of and theres white/beige foamy stuff? Head gasket? Help - Jeep Wrangler Forum
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Old 03-21-2012, 01:26 PM   #1
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There is some white foamy frothy stuff at and around my oil cap under hood? What causes this? Is it a head gasket issue? Thanks, here's a few pics! There's none of it when I check on the dip stick only at top
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Old 03-21-2012, 02:24 PM   #2
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Have you been driving short trips ?
Is the weather there wet and high humidity ?
If so take it out and drive it for a 15-20 miles, then check it again....
You could also check the PCV valve, make sure it's clean...
Looks like moisture from short drives, and never heating up enough to burn off the condensation.... "BH"

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Old 03-21-2012, 02:27 PM   #3
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Old 03-21-2012, 02:31 PM   #4
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Yea I work 3 or so miles from home so def only do short drives, and I live in Breckenridge co, very dry and cold..... Opposite of humidity! Ha... Changed the oil last week and it was there, checked again today and it's back! Hmmmmmm
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Old 03-21-2012, 02:38 PM   #5
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Check your dipstick too...if its got the milkshake look on it as well, then you've got a problem. Have you noticed a drop in your antifreeze?
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Old 03-21-2012, 02:43 PM   #6
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Dipstick oil is perfect! Don't notice any antifreeze in oil but is the white foam a sign of antifreeze getting in to the oil? Confused, engine performance is good, no odd smells, just hope this isn't the sign of a bigger problem..... But as always, it probably is! Ha
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Old 03-21-2012, 07:12 PM   #7
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what did your oil look like when you drained it?
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Old 03-21-2012, 07:16 PM   #8
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Not bad, nothing that caught me eye.
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Old 03-21-2012, 07:20 PM   #9
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have you had it long?? reason being maybe the PO used some kinda additive.
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Old 03-21-2012, 07:24 PM   #10
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Yea about 3 years and I've been pretty on top of all maintenance! It made 2 trips across the country! Since I've owned it, Changed oil in early dec and it was fine,,,,,,,
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Old 03-21-2012, 07:27 PM   #11
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Pcv valve might be clogged or u v have a leak in ur vacuum lines u gettin water in there some how
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Old 03-21-2012, 07:28 PM   #12
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Quote:
Originally Posted by beardown View Post
Yea about 3 years and I've been pretty on top of all maintenance! It made 2 trips across the country! Since I've owned it, Changed oil in early dec and it was fine,,,,,,,
did you use oil that has additives? or is it the same stuff as before?
No strange smoke or anything? have you done any other maitenance?
I'd say change the PCV valve and wait see if it helps. if you have not done it then it's due anyway. cheap part
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Old 03-21-2012, 07:34 PM   #13
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OP....if you're really concerned, contact these guys: Blackstone Labs
and have them ship you a container for a Used Oil Analysis. IIRC it's like $22 for a very thorough UOA and you'll know for sure if there's any coolant in that oil...or any other unwanted things for that matter. Just be sure to run your engine for a good while (20 mile drive or so) to heat it up and burn off any excess fuel in the oil before you obtain an aliquot.
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Old 03-21-2012, 07:53 PM   #14
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No smoke, no smell. The past few oil changes I did use the high mileage oil, but that's it... I did have a few bolts shake loose from tranny mount which caused a few u joints to fail but don't think that could lead to the latest concern.... Right?
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Old 03-21-2012, 08:02 PM   #15
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Quote:
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No smoke, no smell. The past few oil changes I did use the high mileage oil, but that's it... I did have a few bolts shake loose from tranny mount which caused a few u joints to fail but don't think that could lead to the latest concern.... Right?
ah-ha!! I used that high milage in my Bronco 2 and had the same thing happen. then it went away after a thousand miles or so.. I bet it is a red bottle.. there is some kinda additive in there that is causing the issue I bet
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Old 03-21-2012, 08:04 PM   #16
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my liberty did this. its just the moisture from the short trips and not letting the engine warm up enough. As long as you maintain regular oil changes I wouldn't worry it, it's definitely a head gasket, you'd know it then
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Old 03-21-2012, 08:13 PM   #17
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my liberty did this. its just the moisture from the short trips and not letting the engine warm up enough. As long as you maintain regular oil changes I wouldn't worry it, it's definitely a head gasket, you'd know it then
NOT a head gasket.
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Old 03-21-2012, 08:35 PM   #18
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So should I switch back to the regular oil? Look deeper into the issue? Or wait it out with the high mileage stuff? I heard a lot of good things about the high mileage stuff and find it hard to find negatives about it! But..... Don't want the engine to explode either!!! What u guys think?
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Old 03-21-2012, 08:43 PM   #19
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Good (not head g) only reason i thought that was cause I googled white foam oil and that came up more thn a few times! I def haven't driven it more thn 4 miles at a time all winter, (and mountains of colo are very dry) , as it warms I'll drive it further, just dont wanna be on trail with an exploded engine in the middle of summer
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Old 03-21-2012, 08:50 PM   #20
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Would it redevelop a week after an oil change though?
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Old 03-21-2012, 08:51 PM   #21
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Quote:
Originally Posted by beardown View Post
So should I switch back to the regular oil? Look deeper into the issue? Or wait it out with the high mileage stuff? I heard a lot of good things about the high mileage stuff and find it hard to find negatives about it! But..... Don't want the engine to explode either!!! What u guys think?
Run it.....it'll be fine.
check in with the Colorado Section of the forum when you want to get out. We go alot
No reason to ever go alone unless that's your thing. I try to go with at least one other guy Just n case.
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Old 03-21-2012, 08:59 PM   #22
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Ha sounds good! Usually don't go out alone, but buddies def don't have the gear to pull me out and 2000$ tow fee would make me very sad! So u think I should just check it once in a while? Not leakin, not smokin, not smelling, just white foam at oil cap!
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Old 03-21-2012, 09:05 PM   #23
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JUST DRIVE IT ! Your engine has Condensation inside from Normal sitting . You engine HAS to run long enough to get hot and stay hot enough to cook off this condensation. 3 miles to work and a low speed is'nt going to do that.... It's time for a an extended road trip to warm things up and cook off the moisture.
Your oil is fine...Just needs to warm up. Might want to do this once a week til the weather changes and the temps come up..... DEW POINT (????? ) Over my head....
Good luck and quit worrying......"BH"
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Old 03-21-2012, 09:19 PM   #24
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Best news I've heard in a while! Thanks guys! Just wanna head off the problems before they become "problems" ya know , I'll wait it out
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Old 03-22-2012, 11:02 AM   #25
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It's probably a real small leak and condensation is collecting at the very top where the cap is. There is a chemical test at radiator cap to tell if combustion gas is mixing
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Old 03-22-2012, 05:16 PM   #26
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Sounds more like condensation from short drives. As long as the oil stays clean and the antifreeze level doesn't drop, and doesn't show oil in it, you'll probably be OK. Just keep on top of it... check both weekly (should do that anyhow).

On dropping antifreeze level... I had that happen on my 2000 4.0 -- the radiator level kept getting low (never a lot, maybe a pint's worth) while the overflow tank kept filling up. Problem was a leaky radiator cap. When the thing heated and pressured up, it forced coolant into the tank, but when it cooled off, the air was easier to suck than the antifreeze. Cost me some anxious head-scratching, but ultimately a $6 radiator cap cured it.
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Old 03-22-2012, 06:02 PM   #27
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I had this same problem years ago in my 80 CJ7. It had the 258 which was the daddy of the 4.0. I never did find out what caused it. I was checking this thread hoping to find out.
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Old 03-22-2012, 07:28 PM   #28
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Couldn't you see the antifreeze comming out at the cap? And the level of antifreeze is a bit low, and the white, and in your 80 cj did you ever fix it, did it just go away, o what? One of these days I'll change out the antifreeze and inspect it for oil,
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Old 03-22-2012, 07:29 PM   #29
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The short drives in the cold would make since since that's pretty much all I've been doin in it for the past 3 months
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Old 03-22-2012, 11:35 PM   #30
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I never lost anti freeze and never found out what the problem was.

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