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#4623609 - 01/04/18 09:56 AM Sludge in oil cap?
coopns Offline


Registered: 02/16/05
Posts: 790
Loc: Scituate MA
Just changed the oil in 09 Tundra. Oil cap and about 1 inch down oil neck had a beige like sludge covering.

Just curious, any thoughts?
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#4623613 - 01/04/18 10:01 AM Re: Sludge in oil cap? [Re: coopns]
CT8 Online   content


Registered: 10/09/14
Posts: 10925
Loc: Idaho
Is the sludge accumulation new?
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#4623614 - 01/04/18 10:01 AM Re: Sludge in oil cap? [Re: coopns]
knerml Offline


Registered: 04/05/05
Posts: 479
Loc: NE Ohio
That's an emulsion caused by water mixing with oil.

If you are driving short distances and not warming up the engine properly in cold conditions, this can be caused by water condensation.

Or, you may have a water leak, like a head gasket.

Also, check your PVC.
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#4623616 - 01/04/18 10:01 AM Re: Sludge in oil cap? [Re: coopns]
Rolla07 Offline


Registered: 11/05/11
Posts: 4732
Loc: MTL, CANADA
Condensation. Take it for a good ride to get oil hot and re-check it. Check oil on dipstick, if oil isnt cloudy on dipstick its simply condensation. I get same on my corolla. Its not a big deal, water will evaporate once it gets hot enough.


Edited by Rolla07 (01/04/18 10:02 AM)
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#4623618 - 01/04/18 10:03 AM Re: Sludge in oil cap? [Re: coopns]
fenixguy Offline


Registered: 02/08/17
Posts: 307
Loc: NC
Those are areas that never see oil flow (until you pour some in), so they never get cleaned. Happens with many vehicles over time. When the fill cap is directly on the valve cover (4-bangers), it's not as bad.

My old 22-RE Toyota had a baffle directly under the cap (on the valve cover) that built up a gross looking mess. The inside of the engine was spotless.


Edited by fenixguy (01/04/18 10:04 AM)
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#4623627 - 01/04/18 10:08 AM Re: Sludge in oil cap? [Re: fenixguy]
coopns Offline


Registered: 02/16/05
Posts: 790
Loc: Scituate MA
Thanks for the replies.

All I do is 25 slow miles a day going 35. Doesn't get much hiway action.
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#4623634 - 01/04/18 10:15 AM Re: Sludge in oil cap? [Re: coopns]
Trav Offline


Registered: 11/20/06
Posts: 18833
Loc: MA, Mittelfranken.de
100% normal for many engines this time of year here in skunk hollow (MA) and other cold areas.


Edited by Trav (01/04/18 10:17 AM)
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#4623639 - 01/04/18 10:19 AM Re: Sludge in oil cap? [Re: Rolla07]
JHZR2 Offline



Registered: 12/14/02
Posts: 41759
Loc: New Jersey
Originally Posted By: Rolla07
Condensation. Take it for a good ride to get oil hot and re-check it. Check oil on dipstick, if oil isnt cloudy on dipstick its simply condensation. I get same on my corolla. Its not a big deal, water will evaporate once it gets hot enough.


+1

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#4623643 - 01/04/18 10:25 AM Re: Sludge in oil cap? [Re: coopns]
WillsYoda Online   content


Registered: 10/17/15
Posts: 471
Loc: MN
This happened to me every winter until I switched to full synthetic (PP or M1). It does not happen anymore. It is oil and water mixing to make a "mayo" mix.

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#4623655 - 01/04/18 10:33 AM Re: Sludge in oil cap? [Re: coopns]
WyrTwister Offline


Registered: 01/13/13
Posts: 1496
Loc: Texas
Take it out and put some highway miles on it .
Wyr
God bles
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#4623663 - 01/04/18 10:37 AM Re: Sludge in oil cap? [Re: coopns]
ZZman Offline


Registered: 03/17/08
Posts: 5771
Loc: Michigan
Can be pretty common depending on how oil fill shaped and in cold weather. As others said it is most likely normal condensation.
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#4623672 - 01/04/18 10:44 AM Re: Sludge in oil cap? [Re: coopns]
ZebRuaj Offline


Registered: 10/14/16
Posts: 153
Loc: MN
My 4Runner does it too with the 4.0 V6. Yellow mayo/pudding because of short drives during winter. Doesn't help that we've been below 0 for about 2 weeks now and my commute to work is about 15 mins thru town.
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#4623754 - 01/04/18 11:46 AM Re: Sludge in oil cap? [Re: coopns]
Pajero Offline


Registered: 05/05/12
Posts: 837
Loc: Rio Rancho, NM
Pics speak a thousand words!





Respectfully,

Pajero!
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#4623761 - 01/04/18 11:49 AM Re: Sludge in oil cap? [Re: coopns]
tig1 Offline


Registered: 01/03/09
Posts: 13655
Loc: Illinois
If the oil fill tube extends a few inches above the valve cover, often this stuff will form.
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#4623789 - 01/04/18 12:10 PM Re: Sludge in oil cap? [Re: coopns]
blupupher Offline


Registered: 08/27/04
Posts: 4414
Loc: Katy, Republic of Texas
Questions like this pop up every wintertime.
As said, it is condensation that forms, and since many times oil temps do not get hot enough, the water accumulates and starts to turn into a pasty sludge, especially in low flow areas.
A good highway drive every week or so (like an hour at constant highway speeds) should clear it up.
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