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Coolant in Oil? #5138844 06/19/19 09:34 PM
Joined: Jun 2019
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Score294 Offline OP
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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 09:39 PM.
Re: Coolant in Oil? [Re: Score294] #5138861 06/19/19 10:08 PM
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tcp71 Offline
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Looks like old Dino oil to me. Wouldn’t worry about it a bit.


2016 F150 Eco: Edge 0w40
2005 Sienna 3.3: NAPA 5w30 syn. (varies)
Re: Coolant in Oil? [Re: Score294] #5138871 06/19/19 10:17 PM
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josephp732 Offline
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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 10:19 PM.
Re: Coolant in Oil? [Re: Score294] #5138880 06/19/19 10:29 PM
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maxdustington Offline
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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.


99 Toyota Tercel CE 5EFE/C151
Re: Coolant in Oil? [Re: Score294] #5138884 06/19/19 10:36 PM
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PPWarrior Offline
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Yep.

Re: Coolant in Oil? [Re: Score294] #5138887 06/19/19 10:41 PM
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Rygrego Offline
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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 10:43 PM
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4WD Offline
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test

Re: Coolant in Oil? [Re: Score294] #5138905 06/19/19 11:57 PM
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Jetsfan421 Offline
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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 02:23 AM
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Mad_Hatter Offline
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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 02:27 AM.
Re: Coolant in Oil? [Re: Score294] #5138926 06/20/19 02:44 AM
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talest Offline
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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 04:40 AM
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incognito_2u Offline
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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 -115k (M1EP5W30/XG3600)
2006 Toyota Corolla 1.8 VVTi -85k (M1EPHM5W30/XG3600)
1999 Toyota Corolla 1.8 -88k (PUP5W30/XG4386)
1998 Toyota Corolla 1.8 -68k (QSUD5W30/XG3600)
Re: Coolant in Oil? [Re: Score294] #5138953 06/20/19 04:55 AM
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Railrust Offline
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It could very well be just old fashioned moisture, and not coolant.

Re: Coolant in Oil? [Re: tcp71] #5138966 06/20/19 05:22 AM
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ka9mnx Online Content
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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 06:06 AM
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Triple_Se7en Online Content
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Streaks and color changes indicate dilution. Get that oil analyzed for % content.


19' Hyundai Santa Fe 2.4 GDI - Valv Syn 5w30 / Napa Proselect filter / 6oz Liqui-Moly
20' Kia Soul X-Line 2.0 Multi-port / Factory-fill oil / filter
04' Colorado 3.5 / Castrol Edge 0W40 / K&N filter
Re: Coolant in Oil? [Re: Score294] #5139002 06/20/19 06:17 AM
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atikovi Offline
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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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