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Sludge in oil cap? #4623609
01/04/18 10:56 AM
01/04/18 10:56 AM
Joined: Feb 2005
Posts: 794
Scituate MA
coopns Offline OP
coopns  Offline OP
Joined: Feb 2005
Posts: 794
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?


Coop
Re: Sludge in oil cap? [Re: coopns] #4623613
01/04/18 11:01 AM
01/04/18 11:01 AM
Joined: Oct 2014
Posts: 11,849
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,849
Idaho
Is the sludge accumulation new?


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Sludge in oil cap? [Re: coopns] #4623614
01/04/18 11:01 AM
01/04/18 11:01 AM
Joined: Apr 2005
Posts: 543
NE Ohio
knerml Offline
knerml  Offline
Joined: Apr 2005
Posts: 543
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.


2015 Hyundai Elantra Sport 2.0 GDI Mobil 1 5W20 & OEM/Mann W811/80 Filter
2018 Hyundai Santa Fe Sport 2.0T Castrol Edge 5W40 & OEM/Mann W811/80 Filter
Re: Sludge in oil cap? [Re: coopns] #4623616
01/04/18 11:01 AM
01/04/18 11:01 AM
Joined: Nov 2011
Posts: 4,857
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,857
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.

Last edited by Rolla07; 01/04/18 11:02 AM.

2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: Sludge in oil cap? [Re: coopns] #4623618
01/04/18 11:03 AM
01/04/18 11:03 AM
Joined: Feb 2017
Posts: 314
NC
fenixguy Offline
fenixguy  Offline
Joined: Feb 2017
Posts: 314
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.

Last edited by fenixguy; 01/04/18 11:04 AM.

'16 Frontier SV 4x4-PP/Nissan OEM
'08 CR-V EX AWD-Valvoline Syn MaxLife/Fram TG
'01 Civic EX-Valvoline Syn MaxLife/Fram UG
'00 Civic LX-PYB/Fram UG
Re: Sludge in oil cap? [Re: fenixguy] #4623627
01/04/18 11:08 AM
01/04/18 11:08 AM
Joined: Feb 2005
Posts: 794
Scituate MA
coopns Offline OP
coopns  Offline OP
Joined: Feb 2005
Posts: 794
Scituate MA
Thanks for the replies.

All I do is 25 slow miles a day going 35. Doesn't get much hiway action.


Coop
Re: Sludge in oil cap? [Re: coopns] #4623634
01/04/18 11:15 AM
01/04/18 11:15 AM
Joined: Nov 2006
Posts: 19,919
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,919
MA, Mittelfranken.de
100% normal for many engines this time of year here in skunk hollow (MA) and other cold areas.

Last edited by Trav; 01/04/18 11:17 AM.

ASE L1, Master. Deutsch Meisterbrief.
Re: Sludge in oil cap? [Re: Rolla07] #4623639
01/04/18 11:19 AM
01/04/18 11:19 AM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
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

Re: Sludge in oil cap? [Re: coopns] #4623643
01/04/18 11:25 AM
01/04/18 11:25 AM
Joined: Oct 2015
Posts: 475
MN
WillsYoda Offline
WillsYoda  Offline
Joined: Oct 2015
Posts: 475
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.

Re: Sludge in oil cap? [Re: coopns] #4623655
01/04/18 11:33 AM
01/04/18 11:33 AM
Joined: Jan 2013
Posts: 1,842
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,842
Texas
Take it out and put some highway miles on it .
Wyr
God bles


Wyr
God bless
Re: Sludge in oil cap? [Re: coopns] #4623663
01/04/18 11:37 AM
01/04/18 11:37 AM
Joined: Mar 2008
Posts: 5,943
Michigan
ZZman Offline
ZZman  Offline
Joined: Mar 2008
Posts: 5,943
Michigan
Can be pretty common depending on how oil fill shaped and in cold weather. As others said it is most likely normal condensation.


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Sludge in oil cap? [Re: coopns] #4623672
01/04/18 11:44 AM
01/04/18 11:44 AM
Joined: Oct 2016
Posts: 167
MN
ZebRuaj Offline
ZebRuaj  Offline
Joined: Oct 2016
Posts: 167
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.


~Shade tree mechanic for friends and family.
Re: Sludge in oil cap? [Re: coopns] #4623754
01/04/18 12:46 PM
01/04/18 12:46 PM
Joined: May 2012
Posts: 953
Rio Rancho, NM
Pajero Offline
Pajero  Offline
Joined: May 2012
Posts: 953
Rio Rancho, NM
Pics speak a thousand words!





Respectfully,

Pajero!


Always remember "Planned obsolescence."

1994 Montero SR 3.5 DOHC, 133,xxx
Fram Ultra/ Snorkel with Pre-filter
K-9-Co-pilot
Re: Sludge in oil cap? [Re: coopns] #4623761
01/04/18 12:49 PM
01/04/18 12:49 PM
Joined: Jan 2009
Posts: 13,837
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,837
Illinois
If the oil fill tube extends a few inches above the valve cover, often this stuff will form.


2007 Ford Fusion 232,000 miles
M1 0-20 EP
2017 Ford Fusion 55K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters

Re: Sludge in oil cap? [Re: coopns] #4623789
01/04/18 01:10 PM
01/04/18 01:10 PM
Joined: Aug 2004
Posts: 4,636
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,636
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.


1994 Honda VT1100: Peak 15w-40/PSL/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI

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