Question about 2006 GMC Envoy Denali

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My 2006 GMC Envoy Denali seems to be burning oil- the tail pipe is black and the oil level has gone down in the past 1000 miles. I can hear a noise (only when driving, not when in park or idling) that is similar to a "grinding", "clattering" noise (wondering if it's lifters?) I've had my oil changed at 3,000 since it was new and the techs tell me they find nothing wrong and of course they never hear the noise when they have it. It's worse when the engine has been cold. I'm getting near the end of my extended warranty now and I've complained about it numerous times. They are supposed to look at it again on Monday. Any idea what it might be? The car only has under 50,000 miles on it. The GM mechanic once said that it could be an aggressive lifter that is causing me to lose oil. It's not leaking anywhere, either.

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I am having the same problem and the dealer says they checked for an "over-active lifter" - no luck, checked for leaks (there are none!) and checked the plugs, all of which seemed to be darker than they should be. They said the GMC factory rep told them to squirt some clearner in the combustion chamber which will clean out the carbon built-up around the rings. We are to drive the car for 1,000 miles and check to see if the oil level is down. Personally, it sounds like a lot of BS to me!

Posted on Nov 12, 2010

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Had the same problem. There is an updated PCV system as the original drew oil from the crankcase and filled the intake manifold. TB on this (don't know the number). Make sure they clean out your intake manifold as there was oil pooled in mine. If you rev to 2000 rpm in park you can see blue smoke prior to fix.

Posted on Feb 23, 2011

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