2003 CADILLAC CTS COOLANT CONTAMINATED WITH OIL

  • Tiny
  • Kenneth Nutt
  • 2003 Cadillac CTS

Engine Cooling problem
2003 Cadillac CTS 6 cyl Two Wheel Drive Automatic 164000 miles

I noticed that in the coolant reservoir that there was a little contamination from oil in the coolant. A day later it overheated and there was more contamination. It doesn't appear to have any water in the oil in the crankcase though. Any suggestions as to what is the cause of this.

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Thursday, October 1st, 2009 AT 6:51 PM

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  • Tiny
  • obxautomedic
  • Expert
  • 3,743 posts

Hi Kenneth,

First - does it look like engine oil or transmission oil

If it looks kinda reddish it is most likely tranny fluid and the tranny oil cooler in the radiator has failed.

If is engine oil then most likely it is a blown head gasket.

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Thursday, October 1st, 2009 AT 8:50 PM
  • Tiny
  • alexanderbarreiro
  • Member

It's the oil cooler but in this year the oil cooler is located under the intake not in the radiator

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Saturday, December 22nd, 2012 AT 7:51 PM

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