Question about 2001 Chevrolet Lumina

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Thick substance under radiator cap and thinned out oil with a gassy smell

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Hi, Sorry to hear about this problem:

Unfortunatly it points to you Have a Blown Head Gasket,And its more than likely aronud a intake Vavle thats why it smells like gas as well.

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Posted on Oct 10, 2010

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Posted on Jan 02, 2017

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P0302


Thick white smoke is most likely Blown head gasket! the seal between the cylinder block and the cylinder head. Coolant in the cylinders.
Does the white smoke have a sweetness to it? That will be the glycol in the antifreeze. Does it run rough? Is there smoke in the radiator, or fluid pushing out of radiator? Open radiator only when COLD engine or slowly with thick gloves and towel over cap. Allow pressure to bleed off before removing cap completely. White foam in or around the oil filler cap.? Cylinder pressure test will reveal where it is. As will a super clean spark plug. Sorry.

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Sounds like a head gasket, the oily substance is actually oil. Do not drive the vehicle, at some point a $1000 repair will into $3000 repair when the engine seizes.

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