Question about 2003 GMC Sierra 1500

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Sludge in oil and losing anti freeze - 2003 GMC Sierra 1500

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Sounds like a blown head gasket, possibly cracked head if the engine was driven while this problem existed and got hot.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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SOURCE: The jeep has over 204k miles and burns oil. Plus I

You have a bad head gasket,most likely

At 204K/122,000 miles is sort of low,but enough
of an issues with the oil burning,you may want to go with
a new motor.
It will be hard to do a cylinder leak down test for ring
issues, with a bad head gasket.

It is coolant going out the exhaust and oil ruining
your radiator,heater core,etc

Posted on Nov 30, 2010

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The jeep has over 204k miles and burns oil. Plus I am losing anti-freeze and unable to tell where it is going. When I pull the cap to add oil the cap and the oil shaft has a yellow goo. Is it anti-freeze?


You have a bad head gasket,most likely

At 204K/122,000 miles is sort of low,but enough
of an issues with the oil burning,you may want to go with
a new motor.
It will be hard to do a cylinder leak down test for ring
issues, with a bad head gasket.

It is coolant going out the exhaust and oil ruining
your radiator,heater core,etc

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Im losing anti freeze i looked under the car and


If the engine is the same as the 2002 Impala 3.8L engine, the problem is most likely cracked connectors where the coolant enters the engine block. There are two L-shaped plastic connectors that connect the coolant lines through the metal block attached to the tensioner arm to the engine block. Common problem and parts are available from the dealer for under $20, but takes several hours of disassembling and specific torque specs. Just replaced mine over the summer.

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this is a tricky one. I would check the oil level and then the anti freeze. it sounds like the engine is over heating and the wrong oil will do that. but is can also be the anti freeze because their are little flow ports through out the engine and it can be that the ports in the engine are clogged with grim. if the ports are clogged then thiers no way for the engine to cool. and i do beleive that thier is a sensor in the engine that cuts the engine off when its is not recieving any anti freeze.

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