Oil and coolant in the wrong places - Dodge Cummins Diesel Forum
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post #1 of 16 (permalink) Old 05-28-2013, 12:04 AM Thread Starter
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Oil and coolant in the wrong places

So i was cleaning my puke bottle today and noticed a little bit of coolant in the bottle. I took off the radiator cap and noticed some oil had collected around the cap in the radiator. I just replaced the head gasket. Did that gasket fell on me or could it be coming from some other place? I don't see any coolant coming from the head.


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post #2 of 16 (permalink) Old 05-28-2013, 12:15 AM
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what was the color of the oil? Milky white? grey? also i'm assuming the coolant was pure green in the oil bottle? if so chances are some might have fell into the bottle while you removed the head. if your getting oil in your coolant however, i'd be looking at the oil cooler - maybe remove and pressure test it. cheapest 1st.
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post #3 of 16 (permalink) Old 05-28-2013, 12:22 AM
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Did you replace the head gasket because it blew? Reason I ask is you could have some cross-contamination from blowing the head gasket.

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post #4 of 16 (permalink) Old 05-28-2013, 12:22 AM Thread Starter
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The oil didn't look too bad. It was not milky or grey it was black. Yes the coolant in the bottle was just little bit and it was dark green. Ok i will check the oil cooler first. Thank you for your reply!

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post #5 of 16 (permalink) Old 05-28-2013, 12:37 AM
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No problem, just remembered - to save you some time and money, One thing you could try is pressure testing the cooling system first to see if you actually do have an internal leak. if it is the oil cooler, you should notice a bit of a pressure drop, and the oil level will rise accordingly. if no pressure drop, clean everything out and drive it for a while, see what happens ie: losing/making oil, coolant is turning color etc....

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post #6 of 16 (permalink) Old 05-28-2013, 12:40 AM Thread Starter
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Yes i replaced it because i had some coolant leaking fromt the head and was getting some crappy fuel economy.

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post #7 of 16 (permalink) Old 05-28-2013, 02:19 PM
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likely had some cross contamination from when the head gasket went...if you didn't flush your cooling system after changing the head gasket, there will likely be some left over oil in the coolant...


flush the coolant, fill it back up, and check it again later.

oil cooler gaskets may be a possibility, but the oil cooler itself failing is near impossible unless it has taken an impact or you are running concentrated acid for coolant?

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post #8 of 16 (permalink) Old 05-28-2013, 05:58 PM
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Not to start a whole thread robbery/argument, but Iv'e seen more oil cooler elements leak than gaskets - up here in Canada anyway. it is possible if the cooling system wasn't correctly de-aerated when filled, a pocket of air in the oil cooler housing could make it rupture and leak when run at full operating temps for an extended period of time. rememeber 60 psi oil pressure vs 14 psi coolant pressure+weak link..... I'll leave it at that

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post #9 of 16 (permalink) Old 05-28-2013, 06:19 PM Thread Starter
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Thanks for the replies everybody. How often do you see oil in coolant from a bad head gasket? Will i see coolant leaking from the oil cooler gasket if it is bad? Im really hoping that it is not the head gasket.

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post #10 of 16 (permalink) Old 05-28-2013, 07:46 PM
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when my head gasket went, my radiator overflow was literally pissing oil out of it...

as for oil cooler...I still seriously doubt a cummins oil cooler leaked on you...they are made of pretty heavy steel. they are not aluminum and they are not light weight or cheaply made...it is a $500 part that weighs quite a bit..

as for seeing leaks...you can see either leak from one of the two gaskets on there...the oil cooler is a large steel liquid to liquid heat exchanger behind the oil filter between the cylinders in the side of the engine block. (which is a large water jacket)

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post #11 of 16 (permalink) Old 05-28-2013, 09:01 PM
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when my head gasket went, my radiator overflow was literally pissing oil out of it...
Exactly like mine too

I flushed mine with Cascade

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post #12 of 16 (permalink) Old 05-28-2013, 09:28 PM
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Exactly like mine too

I flushed mine with Cascade
I flushed mine with dawn!

dish soap flush FTW!


well actually I got a new radiator and flushed the rest with dish soap...they said my radiator was 80% clogged

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my truck is literally full of Panties already...
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