Oil in coolant reservoir

Tiny
1DIRTYRIDER
  • MEMBER
  • 2014 DODGE TRUCK
  • 5.7L
  • V8
  • 4WD
  • 141,000 MILES
Engine oil in coolant reservoir, no coolant in motor oil, no overheating, no white smoke
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Sunday, June 2nd, 2019 AT 6:16 AM

6 Replies

Tiny
KASEKENNY1
  • EXPERT
Hi,

Have you checked your transmission fluid for coolant? The only reason I ask, is these trucks has a trans oil cooler that has been known to crack. When it does the coolant and trans oil mix and create a milky sludge. Sometimes white in color, sometimes darker depending on the condition of the trans oil.

If not, here are the common causes for oil and coolant to mix. Even though you don't have overheating, it still could be a head gasket.

Have you done a compression check or checked for hydrocarbons in the coolant? Both will indicate a head gasket issue.

Here are a couple guides that will cover the basics. Read through this and let me know what you think and we can go from there.

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

https://www.2carpros.com/articles/how-to-test-engine-compression
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Monday, June 3rd, 2019 AT 2:31 PM
Tiny
1DIRTYRIDER
  • MEMBER
Thanks for the information, I have no way to check the transmission fluid as I have no dip stick, unless I want to have it serviced. I plan on having a leak down test, the coolant in the radiator looks fine but has a slick texture to it, almost feels like mineral oil watered down. I siphoned out the reservoir tank and it looked to be yellowish brown, like motor oil that is time to be changed.
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Thursday, June 6th, 2019 AT 9:18 PM
Tiny
KASEKENNY1
  • EXPERT
Unfortunately that sounds like transmission fluid. If you don't have dipstick that means you have an 8HP70 transmission. Here is a video and the written instruction on how to check the fluid.

If you notice in the video the color of the fluid he is using. It is a greenish color and feels very much like mineral oil. It is not traditional pink/red transmission fluid. If mixed with coolant it can darken in color.

I have seen a few of these where the cooler cracks and the trans and coolant mix. IF this is the case, it sounds like you caught it at the beginning stages.

If it were me, I would pull that plug and inspect the fluid in the trans just to be safe. Obviously if you do this after the leak down test, that would be fine because if you find a head gasket issue then this would confirm engine oil.

https://youtu.be/BPkCUfqi-gE

Let me know what you find. Thanks
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Friday, June 7th, 2019 AT 6:38 PM
Tiny
1DIRTYRIDER
  • MEMBER
Thanks again. Here is some pictures of what I pulled out of the coolant reservoir and what was on the dip stick.
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Friday, June 7th, 2019 AT 7:19 PM
Tiny
KASEKENNY1
  • EXPERT
That looks familiar. I agree that it looks like engine oil and it could be, but I have seen this a number of times and that white gooey residue around the side will eventually be throughout your cooling system. I would check both the cylinder leakage and the trans fluid just to be sure.
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Friday, June 7th, 2019 AT 7:30 PM
Tiny
1DIRTYRIDER
  • MEMBER
I will do the leak down test new thermostat chem flush radiator and pressure test it also, and have trans serviced. I will keep in touch. Thanks for giving me direction in my dilemma.
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Friday, June 7th, 2019 AT 7:39 PM

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