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1999 Buick Regal Oil in the coolant overflow container.

Tiny
CAROLRIENTS
  • MEMBER
  • 1999 BUICK REGAL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 12,000 MILES
I have oil the coolant overflow container and was wondering what this could be caused by.
Monday, October 25th, 2010 AT 11:31 AM

2 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi CarolRients,

Thank you for the donation.

Possible causes are :

1. Bad cylinder head or gasket. Check the radiator for presence of oil in coolant. Check engine oil for presence of coolant, it would be milky in color.

2. Bad transmission fluid cooler. This would result in oil in radiator as well. Check transmisison fluids for presence of coolant, would be milky pink in color.

3. Someone mistakenly topped up with oil instead of coolant.
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Monday, October 25th, 2010 AT 11:41 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi CarolRients, Welcome to 2carpros and TY for the donation

If its oil instead of transmission fluid-could be a blown headgasket, cracked head or block and intake leak. Is the temperature gauge acting abnormal? Check the oil lf its milky colored
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Monday, October 25th, 2010 AT 11:44 AM

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