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Coolant in Oil? #5138844
06/19/19 10:34 PM
06/19/19 10:34 PM
Joined: Jun 2019
Posts: 1
New York
Score294 Offline OP
Score294  Offline OP

Joined: Jun 2019
Posts: 1
New York
Hi,

Long time lurker, first time poster. I recently purchased a '99 4Runner. I believe I did pretty good diligence on the inspection prior to purchasing (no milky stuff under the oil cap) but now after changing the oil I'm concerned I might have a blown head gasket. I was considering trying out Bars Leak. The guy I purchased it from did all of his own maintenance, had old school painter's tape with the mileage on the windshield... I noticed a Fram Extra Guard filter - so leads me to believe he did stuff by the cheapest cost. Is this what dino oil looks like on a 160K engine or does it look like there's coolant in the oil? I just filled with Mobil 5W-30 EP High Mileage, a full quart of Marvel Mystery Oil, and a Fram Ultra filter. I hope this guy didn't screw me as he did not mention any problems mechanically or with the oil. To add to the mystery, car also had a CEL a few days after I drove it for an EVAP leak (despite me checking with my own scanner, none current or pending) - but where I bought it from doesn't test for emissions so I let that go. No bubbles under the radiator, no noticeable leaks anywhere, and no white smoke out of the tailpipe. I did a block test (chemical test with liquid that changes colors if exhaust is detected in coolant) and it came back negative. The pictures have me flashing my light on the oil, was doing it later at night so not natural lighting, not sure if that distorts them. I just fear it looks like the dreaded chocolate milkshake.


[Linked Image]
[Linked Image]
[Linked Image]





Last edited by Score294; 06/19/19 10:39 PM.
Re: Coolant in Oil? [Re: Score294] #5138861
06/19/19 11:08 PM
06/19/19 11:08 PM
Joined: Aug 2013
Posts: 561
Alberta
tcp71 Offline
tcp71  Offline

Joined: Aug 2013
Posts: 561
Alberta
Looks like old Dino oil to me. Wouldn’t worry about it a bit.


2016 F150 Eco: Edge 0w40
2005 Sienna 3.3: mobil 0w40 (varies)
Re: Coolant in Oil? [Re: Score294] #5138871
06/19/19 11:17 PM
06/19/19 11:17 PM
Joined: Mar 2016
Posts: 74
New Jersey
josephp732 Offline
josephp732  Offline

Joined: Mar 2016
Posts: 74
New Jersey
It certainly does look like there might be coolant in the oil - it's a bit milky, interesting you don't have any other signs of a leaking head gasket. Have you removed the spark-plugs and preformed a compression test? It also could be very used conventional oil. I would run your new oil for ~500 miles and then send a sample in to a lab for testing.

Last edited by josephp732; 06/19/19 11:19 PM.
Re: Coolant in Oil? [Re: Score294] #5138880
06/19/19 11:29 PM
06/19/19 11:29 PM
Joined: Jan 2017
Posts: 3,039
VW Fanboy Island
maxdustington Offline
maxdustington  Offline

Joined: Jan 2017
Posts: 3,039
VW Fanboy Island
That third pic with natural light looks right as rain.

I'm not sure the goo on the oil cap means what you think it means.


03 Jetta AWP/09A 210k kms
Edge 0W40 + Mann 719/30
Re: Coolant in Oil? [Re: Score294] #5138884
06/19/19 11:36 PM
06/19/19 11:36 PM
Joined: Dec 2018
Posts: 209
Texas, USA
PPWarrior Offline
PPWarrior  Offline

Joined: Dec 2018
Posts: 209
Texas, USA
Yep.


nissan versa m/t
chevy imapala auto
toyota corolla auto
Re: Coolant in Oil? [Re: Score294] #5138887
06/19/19 11:41 PM
06/19/19 11:41 PM
Joined: May 2017
Posts: 11
California
Rygrego Offline
Rygrego  Offline

Joined: May 2017
Posts: 11
California
If you're going to try a sealant try K-seal best product of its kind. Once it works you can flush out the remainder. It is permanent.

Re: Coolant in Oil? [Re: Score294] #5138890
06/19/19 11:43 PM
06/19/19 11:43 PM
Joined: Sep 2010
Posts: 9,615
Texas
4WD Online confused
4WD  Online Confused

Joined: Sep 2010
Posts: 9,615
Texas
test

Re: Coolant in Oil? [Re: Score294] #5138905
06/20/19 12:57 AM
06/20/19 12:57 AM
Joined: Jan 2019
Posts: 100
Illinois
Jetsfan421 Offline
Jetsfan421  Offline

Joined: Jan 2019
Posts: 100
Illinois
From the looks of that oil it could either be very used conventional oil, or a slight leakage of coolant. Save the oil and send it off for analysis. Before clogging your coolant system with stop leaks I'd just fix the gaskets, but I like wrenching and am capable.

Re: Coolant in Oil? [Re: Score294] #5138924
06/20/19 03:23 AM
06/20/19 03:23 AM
Joined: May 2019
Posts: 776
WA
Mad_Hatter Offline
Mad_Hatter  Offline

Joined: May 2019
Posts: 776
WA
The only time I've ever had choco milk oil was a blown head gasket on a Ford Tempo many many moons ago. Curious, are your spark plugs wet? Does your oil smell like fuel? If not, then it's not gas and probably coolant. Personally, i've had dino in an engine for a gazillion miles (that previously mentioned Tempo) and it just keeps getting black as night unless there's a moisture issue.

Have it tested before you do anything. You might use your scan tool to see when the last time DTC's were cleared.

Last edited by Mad_Hatter; 06/20/19 03:27 AM.
Re: Coolant in Oil? [Re: Score294] #5138926
06/20/19 03:44 AM
06/20/19 03:44 AM
Joined: Apr 2018
Posts: 485
US
talest Offline
talest  Offline

Joined: Apr 2018
Posts: 485
US
Is your coolant level going down?
How cloudy or puffy is your exhaust, if at all? Any white smoke that smells like coolant?
Driveability. Is the throttle response sometimes muted, or not instantaneous?

If it is a small leak, you have some options. The best fix, if it is that, is of course new gaskets, if that is not cost-prohibitive. But there may be one. I would change the oil and look for a decrease in coolant level first.

Re: Coolant in Oil? [Re: Score294] #5138947
06/20/19 05:40 AM
06/20/19 05:40 AM
Joined: Dec 2016
Posts: 222
Long Island, N.Y.
incognito_2u Offline
incognito_2u  Offline

Joined: Dec 2016
Posts: 222
Long Island, N.Y.
First and foremost, Welcome! welcome

The oil does look suspect, but I wouldn't add any magic elixir's just yet...…….let that fresh Oil Change play out and monitor your engine...….watch for Coolant loss, Oil in the Coolant, white smoke, overheating, ect and make your evaluation on what is observed.

Could be getting worked up over nothing. Enjoy your new ride!


2006 Jeep Commander 3.7 V6 -113k (PUP5W30/XG3600)
2006 Toyota Corolla 1.8 VVTi -82k (M1EPHM5W30/XG3600)
1999 Toyota Corolla 1.8 -86k (QSUD5W30/XG3600)
1998 Toyota Corolla 1.8 -65k (PUP5W30/XG3600)
Re: Coolant in Oil? [Re: Score294] #5138953
06/20/19 05:55 AM
06/20/19 05:55 AM
Joined: Feb 2019
Posts: 261
New Hampshire
Railrust Offline
Railrust  Offline

Joined: Feb 2019
Posts: 261
New Hampshire
It could very well be just old fashioned moisture, and not coolant.

Re: Coolant in Oil? [Re: tcp71] #5138966
06/20/19 06:22 AM
06/20/19 06:22 AM
Joined: May 2018
Posts: 975
South Carolina
ka9mnx Offline
ka9mnx  Offline

Joined: May 2018
Posts: 975
South Carolina
Originally Posted by tcp71
Looks like old Dino oil to me. Wouldn’t worry about it a bit.

Yep


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Coolant in Oil? [Re: Score294] #5138995
06/20/19 07:06 AM
06/20/19 07:06 AM
Joined: Dec 2004
Posts: 11,355
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline

Joined: Dec 2004
Posts: 11,355
1/2 hr N.E. of Detroit
Streaks and color changes indicate dilution. Get that oil analyzed for % content.


19 Hyundai SantaFe 2.4GDI Castrol Edge 5w30 / NAPA Mann-Hummel filter / 6oz Liqui-Moly Treatment
04 Colorado 3.5 Castrol Edge 0W40 Euro & K&N filter
03 Malibu 3.1 QS / Valv Syn 5w30 mix Fram EG filter
Re: Coolant in Oil? [Re: Score294] #5139002
06/20/19 07:17 AM
06/20/19 07:17 AM
Joined: Apr 2010
Posts: 1,759
Suburban Washington DC
atikovi Offline
atikovi  Offline

Joined: Apr 2010
Posts: 1,759
Suburban Washington DC
I'd change the oil and filter in 500 miles (if it makes it that far) just to flush out the system and see how it looks then.

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