Question about 2007 Chevrolet Avalanche LTZ

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Iam going through a lire and a half to two litres of oil between my oil changes,what is causing this?

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  • Jeffrey Turcotte
    Jeffrey Turcotte Nov 24, 2010

    engine may not have been broken in properly. Nothing you can do except try different oils. Penzoil seems to hold up better in these cases.

  • tuff_wuv Nov 24, 2010

    after looking through internet at problems with Avalanche,noticed there is alot of complaints about oil consumption.Thinking not every Avalanche owner hasnt broken in enegine properly?



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  • Chevrolet Master
  • 5,692 Answers

Try to get work done under Warranty as you have about a 3 Year old truck. For this kind of oil loss you must have bad piston rings or valve stem seals or a leak. The best exam for your truck would be to pull the sparkplugs and check their condition, then do a compression test.

A quick test, an Electronic cylinder balance test would only give minimal information for weak compression but is not intrusive. When Piston rings are installed their ends are staggered to seal in oil and compression. If they were not staggered when installed or if they rotated by themselves; all the gaps will line up and you have problems.

Another non-intrusive test is a chemical tracer test. Some Autoparts stores may carry kits for this. The kit has an Ultraviolet pen flashlight, colored Goggles, and a chemical additive for the oil.
You add the chemical to the oil, run the vehicle, then use the penlight and Goggles to see if the oil is coming out of the engine. There will be a Glow and you can see oil everywhere.

When you contact the Dealer you can also ask about Service Bulletins for your particular Model. I hope my Suggestions have helped you. Would be interested in your results.

Posted on Nov 24, 2010

Testimonial: "I am on my way to dealer today,hopefully warranty will cover as my avalanche only has 64,000 km's."

  • Brooks Leib Dec 10, 2010

    I had a similar problem with oil consumption... ended up being a faulty PCV valve. I still use about 1/2 litre between oil changes, but reduced my consumption by at least 1 full litre. Also, have you valve covers inspected for any cracks / leaks. My repairs were covered by GM after opening a complaint.

  • fordexpert Dec 11, 2010

    Hello, has the Dealer helped you? Someone left a note about defective PCV valves and it reduced oil consumption by 1 liter when replaced.



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