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2006 gmc envoy_denali_xl
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Discussion Starter · #1 ·
Hope someone can help, searched the threads but didn't see my issue. Bought a used (Certified) 06 Denali. To be honest we have had it in three times in 3 months, mostly little crap.

I haven't changed the oil yet, but checked it before a trip over Christmas and needed to add a quart. Just thought the dealer never topped off so didn't think much about it. Checked at the end of the trip, needed another 1/2 quart. And just added another 1/2 quart today.

Call me crazy but I shouldn't have to be adding 2 quarts between oil changes with 34K on it. No leaks that I can find underneith and nothing on the garage floor. Not seeing any smoke or signs of burning oil. Engine is running fine, and not throwing any codes.

We had a 04 Envoy with the I6 and over 90K when I traded it in. Never once did I add oil btwn oil changes. Getting a little concerned we my have a problem child.

Any ideas?:confused:
 

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2005 chevy trailblazer_ls_ext
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I would say you definitely have a problem somewhere. As you probably already know - oil can only disappear in one of two way. Either the engine can burn it by the oil getting past the rings and/or valves, or it is leaking somewhere.

Sometimes an engine CAN burn oil and it will not be enough that you can see it while you are driving.

Something you could try is - change the oil and use a different brand. I have heard (but never experienced) that occasionally a different brand of oil will cause it to use oil. I'm not sure I buy it - but that's what I've heard, and like I said I've never seen that happen in any of my vehicles.

You can try complaining to the dealership, but they are probably going to tell you nothing is wrong.

I usually go about 7K - 9K miles between changes and have never had to add oil - with the exception of when the engine was new I had to add one quart.
 

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2007 chevy trailblazer_ss_1ss
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You bought a certified car, so that means it shouldn't have any problems like that. Take it back and have them look at it, besides you're probably still under warranty anyway (or at least close enough where they could good-will the repair).
 

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I'd bet that this level of oil consumption is considered normal by GM.

To fix this you need a lot of engine work. Cost would no doubt be thousands of dollars, and the problem might not be fixed. Even if you use synthetic oil at $5 per quart, $1000 will buy 200 quarts of oil.

You don't say in your post, but just exactly how much oil is your truck using? Are you using synthetic oil? If so stop using synthetic. Also, changing brands might help this issue as well.

In any case, I don't think GM will do anything for you.

Try the things listed above. Keep us posted.

-- Dan Meyer :coffee
 

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2007 chevy trailblazer_ss_1ss
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The accepted usage is 1 qt. in 2000 miles. Doesn't matter though, it's a certified car and shouldn't have a problem like that.
 

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2002 chevy trailblazer_ls
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1,121 Posts
Could be leaking around valve cover gasket? Mine has started using quite a bit.. I just add it.. until I can pinpoint whre eit's coming from. I don't think it's blow by (ring failure) because it does not smoke at all.. on startup or any other time. I have noticed a little seepage near the CPS or whatever it's called.
 

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2006 gmc envoy_denali_xl
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Discussion Starter · #8 ·
I've put about 2 quarts in for about 2-3000 miles. I have not changed since I bought, but assumed that the dealer used regular 5W30 not syn. Owners Manual calls for regular. Mostly after highway driving. Figured I'd call the dealer in the am and see what they say. Really disappointed however, have had a bunch of crap with this one. And I would would have thought a Denali would be better built then a base Envoy XL. Had no problems with that.
 

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2007 gmc envoy_denali
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396 Posts
check the POSTIVE CRANK VENTILATION SYSTEM PCV its maybe the engine not cooled by air i,m mean from inside this valve could make the oil boiling if its defected or check the engine oil cooler if you have my biggest idea is your oil is over temp
 

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2005 chevy trailblazer_ls_ext
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2006 gmc envoy_denali_xl
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Discussion Starter · #11 ·
First off this is a 5.3 not the I6, second, I would assume if the oil is over heating the engine would be as well? That does not seem to be a problem.

I did call the dealer today. I will take it in and they want to change the oil and put a dye in then check every 1000 miles, however he did say they have a bulletin that says the motor can use up to two quarts between oil changes and still be normal. That seems like a lot to me and from this forum I don't see anyone else saying they have this issue, particularly on a motor with 34K on it.

I am certainly not an expert, would like to know if anyone else has experianced this on a 5.3.
 

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2007 gmc envoy_denali
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the I6 does have the PCV check this picture its should i haveit before on V6 4.3L 262 i dig more for hole system and parts that just for now
number 503 PCV hose form crank case
 

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2005 chevy trailblazer_ls_ext
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the I6 does have the PCV check this picture its should i haveit before on V6 4.3L 262 i dig more for hole system and parts that just for now
number 503 PCV hose form crank case
Read my post very carefully. I said it doesn't have a PCV VALVE! Yes there is a hose, but not a serviceable valve like many cars have.

This is also mentioned in the link I posted to the other thread.

What you had before in a V6 4.3 engine really doesn't have any bearing with what our engines have. Completely different animals!
 

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2006 gmc envoy_denali_xl
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Discussion Starter · #15 ·
Uh then you might want to change the info on your profile. In your first post, you did not mention it was a V8 instead of the I6.
Sorry, had an 04 with an I6 when I signed up to this post. Traded it for an 06 Denali in October. I will update my profile.
 

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2007 chevy trailblazer_ss_3ss
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purchased on 06 denali as well, had it for a month now and have not changed the oil. I checked recently and it is just above the lower XXX marks on the dip stick.. I would figure that the dealer would change the oil and fill to the top of the XXX marks..

did you find out what is going on with your Denali and what did the dealer do to fix? or if they even fixed??
 

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2006 chevy trailblazer_lt
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I bought a used 5.3L TB in December with 51k. I now have about 55k on it, meaning I have driven 4000 miles or so. The oil had been changed by the dealer, and it was full when I picked it up.

I have now put two quarts into it. The oil life monitor says 29%.

Previously I had an I6 03 Envoy, and went 10k without putting in a quart. So, I"m spoiled, as are you.

BUT, until I had an I6, I would have thought that one quart every 2000 miles was perfectly acceptable. That is about what I get in my 3.8L Bonneville.

My tentative conclusion is that a quart every 2k is "normal" for the 5.3L.

My other conclusion is that if I am replacing 40% of my oil before the oil life monitor says change the oil, then I can go 40% longer before I change my oil. I'll reset the monitor but not change the oil, and then change it when I get down to 60%, by which time I'm sure I'll have added yet another quart.

Just my thinking.
 

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2005 chevy trailblazer_ls_ext
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My other conclusion is that if I am replacing 40% of my oil before the oil life monitor says change the oil, then I can go 40% longer before I change my oil. I'll reset the monitor but not change the oil, and then change it when I get down to 60%, by which time I'm sure I'll have added yet another quart.

Just my thinking.
I would rethink your thoughts! :D

Going on your theory, you would almost never have to change the oil!:crazy:

I would change your oil when the OLM states to and call it a day. Oil changes are relatively cheap - engines are not.
 

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2005 chevy trailblazer_ls
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According to the service manual for the 5.3, "Excessive oil consumption, not due to leaks, is the use of 1 qt or more of engine oil within 2,000 miles."

Preliminary causes listed are:
-External oil leaks
-Incorrect oil level or improper reading of the stick
-Improper oil viscosity
-Continuous high speed driving and/or severe usage
-Crankcase ventilation system restrictions or malfunctioning components
-Worn valve guides / stems
-Piston rings broken, worn, or not seated properly
-Piston and rings improperly installed or not fitted to the cylinder bore.

For the 4.2, it's 1 qt within 1,500 miles. Same causes.
 

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2007 chevy trailblazer_ss_3ss
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since I have yet to change it since I got it from the dealer since driving it approx 3k miles. The DIC states I have 70+% I don't think that is right. If that is the case I can drive 9k before It reaches 10% oil life left. I am hoping that it was just reset on accident prior to me getting the car.
 
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