1996 Buick Park Avenue There is engine oil in the engine co

Tiny
ELTOPO
  • MEMBER
  • 1996 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 144,444 MILES
Also coolant appears to be leaking on the outside of the upper intake manifold. But only when the engine is warming up and the radiator is full. The leak appears to be on the rear of the car, side, of the manifold, and the throttle body end of the manifold.
Engine seems in good shape. No smoking, getting 26mpg on highway. Engine used about a 1/2 aquart of oil in last couple hundred miles. I had changed coolant and engine oil 1500miles ago so thats how I know theres oil in coolant and oil level went down. Starts great runs great.
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Tuesday, May 4th, 2010 AT 5:29 PM

9 Replies

Tiny
MMPRINCE4000
  • EXPERT
If oil in coolant, then the intake manifold gasket would be suspect.
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Wednesday, May 5th, 2010 AT 7:57 AM
Tiny
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If intake manifold upper or lower? How to test? Thank You
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Wednesday, May 5th, 2010 AT 1:28 PM
Tiny
MMPRINCE4000
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Lower.

Test with a cooling system pressure test.

MAKE SURE the head gaskets are OK before doing the cooling system pressure test.
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Thursday, May 6th, 2010 AT 9:49 AM
Tiny
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How to check that head gaskets are O.K?
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Thursday, May 6th, 2010 AT 11:56 AM
Tiny
MMPRINCE4000
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With a compression test.

If head gasket is leaking, it is possible a cooling system pressure test could cause coolant to leak into cylinder and hydrolock the engine.
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Friday, May 7th, 2010 AT 7:50 AM
Tiny
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How many PSI should each cylinder have?
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Friday, May 7th, 2010 AT 5:20 PM
Tiny
MMPRINCE4000
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Between 150-160, but more importantly ther should NOT be more than 20% difference between cylinders.
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Saturday, May 8th, 2010 AT 8:38 AM
Tiny
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Thank You. I'll try that.
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Saturday, May 8th, 2010 AT 1:20 PM
Tiny
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Let me know what you get.
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Sunday, May 9th, 2010 AT 7:53 AM

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