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Username Post: 1984 SBC 305 : oil in coolant        (Topic#326932)
Shnalla 
Forum Newbie
Posts: 9
Shnalla
Age: 34
Loc: Lyon, France
Reg: 07-07-15
07-25-15 04:46 PM - Post#2564054    

Hi,

There is a bit of oil in my coolant, but no coolant in my oil.
Also the engine does not overheat and runs fine. I'm wondering if it could be transmission oil leaking through the radiator...
Oil in the transmission looks good.

I'm afraid engine or head crack causing oil in coolant. Is there a way to check for both engine crack and transmission oil leaking in the radiator ?

Many thanks

1972 Chevy Monte Carlo / 1984 Chevy Caprice Wagon / 1992 Buick Park Avenue


 




KShortell 
Senior Member
Posts: 4052
KShortell
Loc: Chesapeake, VA, U.S.A.
Reg: 04-14-01
08-05-15 05:46 AM - Post#2566535    
    In response to Shnalla

If your coolant looks like chocolate milk, then you likely have a cracked head or block. You won't likely ever see coolant in the oil as it gets boiled off and vented, never remaining in the oil.

Good luck!

Semper Paratus
FL05-03 Home Page
Stock is not a dirty word...


 
fbi9c1 
Frequent Contributor
Posts: 1921

Loc: Los Angeles
Reg: 08-07-07
08-10-15 01:11 PM - Post#2567803    
    In response to KShortell

I think there is a good possibility that this is trans fluid from the cooler in the radiator and I would investigate that thoroughly before concluding that it is a head gasket. A leakdown test for head gasket problems is in order as well. Good luck

Jim B.


 
Shnalla 
Forum Newbie
Posts: 9
Shnalla
Age: 34
Loc: Lyon, France
Reg: 07-07-15
08-11-15 05:19 AM - Post#2567970    
    In response to KShortell

Thanks for your answers.

  • KShortell Said:
If your coolant looks like chocolate milk, then you likely have a cracked head or block. You won't likely ever see coolant in the oil as it gets boiled off and vented, never remaining in the oil.

Good luck!


To be honest, my coolant does not looks like chocolate milk, so my guess is that cooling system is still dirty. After flushing it 7 times, I still see rust when I open my radiator cap.

  • fbi9c1 Said:
I think there is a good possibility that this is trans fluid from the cooler in the radiator and I would investigate that thoroughly before concluding that it is a head gasket. A leakdown test for head gasket problems is in order as well. Good luck


Trans fluid level is still ok, but it may be leaking just enough to create that dark mixture in coolant ...

I will test the engine for leaks soon.

1972 Chevy Monte Carlo / 1984 Chevy Caprice Wagon / 1992 Buick Park Avenue


 




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