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2006 gmc envoy_denali
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Discussion Starter · #1 ·
Having problems with 2006 Envoy Denali V8.
I've read the thread from earlier, where they were having problem with oil disappearing.
This has happened twice to me in the last year. Once last summer when my daughter was on a trip, she heard ticking and took Envoy to GMC and was 4 qts low.
Have always had oil changed at GM dealer before getting to 20% life.
In Jan '09 had GMC perform 30G tune-up. Closer to 38G, Oil was changed. have driven 2500 miles since.
Today, started running really rough, checked oil,(on level ground) and it was 4 qts low! Oil pressure never changed on dash,even after adding oil, stayed above 1/2 way around 50.
Engine light did come on steady and then flashing.
I have checked driveway and work parking and see zero oil stains.
I am still under extended warranty, and plan on returning to GMC.
Am I looking at some serious engine repairs?
 

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2005 chevy trailblazer_ls
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4 qts in 2500 miles...sounds major. Good thing you're under warranty. Get it to them soon. No coolant on the dipstick? What you're describing sounds sort of "head/gasketish". (New word!!) Or piston blowby, but that sounds like a lot not to notice anything. Have you checked the inside of your tailpipe? Any oil/black residue there? White smoke?
Remember the gauge does not mean oil level, but oil pressure. So, what oil is in there is still pumping.
Either way, make an appointment with the dealer to have that thing checked out and repaired.
 

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2004 gmc
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Remember the gauge does not mean oil level, but oil pressure. So, what oil is in there is still pumping.
We're properly in the V8 forum, and that engine has a normal continuous pressure sensor. It's only the I6 owners who got disrespected with an on/off switch.
 

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2005 chevy trailblazer_ls
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Oops! My fault...slipping out the back door silently. :eek:
 

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Any Update?

Just wondering if you had this fixed? Mine is in the shop right now for the same reason, low oil but no leak. We didn't change the oil for about 5,000 miles after we bought it used because I was going by the engine oil life monitor, which they told me to ignore now and change every 3,000. Anyway, it was almost out and the engine was clicking and no lights were on. Got the oil change, told us to check it in 1,000 miles and sure enough, already at least a quart low. I just dropped it off yesterday so I am wondering what kind of work needs to be done. It's almost out of warranty so I am glad it's getting checked now.
 

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Just wondering if you had this fixed? Mine is in the shop right now for the same reason, low oil but no leak. We didn't change the oil for about 5,000 miles after we bought it used because I was going by the engine oil life monitor, which they told me to ignore now and change every 3,000. Anyway, it was almost out and the engine was clicking and no lights were on. Got the oil change, told us to check it in 1,000 miles and sure enough, already at least a quart low. I just dropped it off yesterday so I am wondering what kind of work needs to be done. It's almost out of warranty so I am glad it's getting checked now.
Of course they will tell you that. More $ for them! Actually on these engines 5K miles is very conservative.
 

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Oh trust me...I went round and round with them because the oil life monitor said I had 12% left...so why would I change the oil? They told me that I was wrong and no to go by that gauge that it was proper to change the oil every 3,000. I have been meaning to call GM directly and ask them why they install something in the cars that the dealers are telling us to ignore...
 

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Oh trust me...I went round and round with them because the oil life monitor said I had 12% left...so why would I change the oil? They told me that I was wrong and no to go by that gauge that it was proper to change the oil every 3,000. I have been meaning to call GM directly and ask them why they install something in the cars that the dealers are telling us to ignore...
:yes: I hear you. When I bought my TB, the sales lady was sure to point out the OLM, the fact that the coolant didn't need changed for 5 years or 150,000 miles, etc.

First time of many I had it in for repairs, the service manager kept saying things like - you need an oil change. Your last oil change was 4,000 miles ago. When I said "You guys don't go by the OLM"? He said "Oh well I guess if you want to do it that way" or something to that effect. :(

I got a notice in the mail from the dealership at around 30,000 saying it was time for my "30K mile checkup" which included changing the coolant!

I contacted GM - for all the good it did. I got a canned response of "Service advisers recommend what they think the individual vehicle needs based on mileage and time, etc." :duh::hissy:

BTW just for fun, ask them to show you in the owner's manual where it states 3K miles is the proper oil change interval. :)
 

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Oh that's funny. Guess there is no use writing GM. Have you read the owner's manual? I did after my first run in with this and it says that the OLM is based on motor rotations, not by mileage. That makes sense to me, the more the oil circulates through the chance of oil change is higher...

Here is what the dealership just wrote me about mine:

"JV is currently soaking the top of the engine with top engine cleaner to de-carbon the pistons. What can happen is that the rings on the pistons won’t expand and seal the oil going past them-allowing oil to burn. After this is done, we will change the oil, clean the plugs and return the vehicle-If after a thousand miles and it is still burning oil, we will go into the motor, pull pistons etc."

Sounds like I'll be getting it back soon and will just have to keep a close eye on it. I am just worried because I am getting right to the end of my factory warranty, so I hope they aren't trying to pull something to get me to go over.
 

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2003 chevy trailblazer_ls
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its been documented that your losing oil- make sure its on Dealer printed paperwork. that way it goes into the vehicle database.
If it fails in the near future- you have proof that this occured while still on warranty..... (right guys?)

As for the 3000 mile oil changes....
you can follow the OLM... BUT check the oil level often. The manual states it can be done when gassing up. (I personnally do it every other week when I wash my truck).

Several years ago--- GM sent out letters to Dealers stating to stop recommending 3000 mile oil changes and to use the OLM....as an example... I am currently at 10,100 miles since my last oil change....
im guessing the light will come on somewhere in the next 500 miles.
 

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Oh that's funny. Guess there is no use writing GM. Have you read the owner's manual? I did after my first run in with this and it says that the OLM is based on motor rotations, not by mileage. That makes sense to me, the more the oil circulates through the chance of oil change is higher...
Absolutely! Probably one of the first things I did after driving the vehicle home! :)

Yes, the OLM is based on engine revolutions, and OTHER things as well. Things like load, temps, number of start/stop cycles.

In my 05 manual, the only mention of changing the oil by mileage, is if the OLM gets "accidentally reset" Then it states:
"If the engine oil life system is ever reset accidentally , you must service your vehicle within 3,000 miles (5,000 km) of your last service."

The only other reference to time is if the OLM doesn't indicate a service is due within one year, to change the oil then.

Yeah you just got to love dealing with dealerships! :(

This is slightly off topic - but more about my experience with dealerships.

About a year after I bought this truck, I noticed the A/C didn't work very well around town. My wife and I were celebrating our anniversary in the Los Angeles area in the month of August. It was hot and muggy. Outside air temp was about 95 - 100, air coming out of the vent was about 90 degrees.
Once we got on the freeway it would freeze us out.
Of course the dealership said "That's normal". Sorry I think not. I don't expect 35 degree air when idling, but I don't expect 90 degree air coming out the vents either.

The dealership I bought it from was in San Diego. I make an appointment for them to check it out. They called and said "It's putting out 45 degree air from the vents. Everything is fine and checks out normal."
I said "What's the ambient air temp. in San Diego right now"? The service adviser paused for about 5 seconds and said "I don't see what that has to do with anything, but it's about 65 degrees."

I said "Of course it's going to cool when the ambient temp. is 65. But what about when it's 90 - 100 or more?" He said again "Oh that's normal - it will not cool with around town driving as well as on the freeway". I mentioned that my other 12 year old vehicle does much better than that "around town".
I also asked if he knew about the TSB for the fan clutch. Another long pause. "What TSB? Do you happen to have the number?"

Thanks to this site and the wonder people here - I DID! I gave it to him. Next day he called and said - they replaced the clutch and I was good to go.
I now get about 45 - 50 degree air at an idle on hot days (90 and above).
So much for "They all do that - it's normal"
 

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I've been through the same thing with my A/C, they fed me the whole living in Florida what do you expect - it's so hot outside it's doing all it can. Bunch of crap if you ask me.

So they just called and said my car is done. He told me that it was 1.5 quart low...then he had the nerve to say, unfortunately, a car with that many miles will burn oil. It has 50,000 on it, I said...Ok maybe it does, I'm not a mechanic, but not 1.5 quarts in 1200 miles!! That would be ridiculous! My mom drives a van with 150,000 miles and she would be out of oil weekly if it burnt oil at that pace based on mileage. Why do they try and treat like you are an idiot??? So I am going to pick it up tomorrow, they said there were definately no leaks, he said they want me to bring it back in 1,000 miles so we can see where the oil level is...the story will continue I'm sure.
 

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I know this is regarding the V8 engines, but my TB 4.2 does this occasionally. I was driving through CO and used 1.5 qt in just under 400 miles!!! I talked to a tech and he checked it out and said it might have something to do with the different fuels I was getting in different states along with dramatic climate differences. But when i got home it did it again. I am very diligent about checking my oil and there was about 6k mi between these two instances.

Also my Oil life crap has never come on once I usually get nervous and change it.
 

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2006 gmc envoy_denali
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Discussion Starter · #14 ·
Update: Sudden oil loss Denali

Fixed for now!?
GMC repair said there was a leak in the #7 cylinder.
They replaced the valve seal and cover and told me to come back after I had drove it 1000 miles and have it checked again. That should be in a couple of weeks.
I don't even think they changed the oil, just added to the burnt stuff.
They had also mention that they had recently received a notice from GMC to be on the lookout for this type of failure.
Sounds like a growing problem.
 

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They told me the 1, 3 and 7 were leaking on mine but they cleaned it because the carbon buildup could cause the leak. Same here, I have to go back in 1,000 miles for recheck. He told me there was a "service bulletin" on it so they have to record what happens at the 1,000 miles and report to GM...the saga continues...
 
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