Burning oil in 2004 Tahoe

Tiny
JENNIFER DAIGLE
  • MEMBER
  • 2004 CHEVROLET TAHOE
  • V8
  • 2WD
  • AUTOMATIC
  • 92,811 MILES
In 2009, we discover the heads had a bad casting and porous cracks not visible to the eye, but failed a pressure test. So, they were replaced. Before the replacement, the vehicle did not burn oil. After, the vehicle is burning oil. I'm thinking it's the rings are failing, but it still gets good compression and no visible oil leaks are seen on the engine, or concrete drive. I'm not seeing a change in the coolant level and no overheating issues have been seen on this vehicle. What do you think it is and should I be concern a major breakdown is on the horizon? I'm having to place 1 quarter of oil every month. Example, oil change in Feb. 2011, End of March she was 2 quarters low.
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Sunday, April 3rd, 2011 AT 7:48 PM

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Tiny
PROTECH1980
  • EXPERT
The accepted rate of oil consumption for that engine 1 qt in 3200 km (2000) mi. That being said I would check the PCV system, replace the pcv valve, and check the line going to it, if there is raw oil in it, remove the valve cover and clean out the baffle system, if this pcv system is'nt working right it can cause oil consumption greater than the accepted rate.
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Monday, April 4th, 2011 AT 1:56 AM

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