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Add engine oil!!!

Truston Gunter

By Truston Gunter
in 6.6L Gas V8 (L8T)

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Pryme Senior Enthusiast

Pryme

Posted
Posted

I have 2,300 miles on this oil (my first oil change I did at 800mi) truck has 3,100 now and oil still at the full line. 
 

just checked it to see. 

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Flatus
Flatus

Mine burns excessive amounts of gasoline.

diyer2
diyer2

While I have never approached things like an engineer would, I have just kept motors in an as new condition and changed the oil and filters. I do applaud the science part but never used it and never h

MacLaren
MacLaren

Ok fellas, I've got a 2021 Gasser, just took in for an oil change (every 5k) and, they told me she wasn't even low. And, we've been on 5 camping trips during this 5,000 mile stretch. We haul an 11,000

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Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

Oil light update...

 

So far the dealer can't find any reason why the oil light came on (besides the obvious, the oil was low) No leaks, plugs are not fouled, PCV is good... they are now working with GMC on next steps

 

And for the kicker, after 600 miles (I was corrected by the dealer, it's closer to 600 not 800 miles since they changed the oil and started the oil consumption test) the motor was 4 Qts low... WTF

 

Now there is another issue, why didn't the oil light come on sooner?  AND, why didn't the light come on when I drove it to the dealer last week when it was 4 Qts low...

 

With this being said, we are scheduled to leave mid March on a cross country trip taking the RV to visit family for 3-4 months. I'm now pushing the dealer to replace the motor b/c I don't trust a "fix"... or what damage might have been done to this motor with less than 20k miles

 

What a mess

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Jettech1 Senior Enthusiast

Jettech1

Posted
Posted (edited)
8 minutes ago, Rick Schleicher said:

Oil light update...

 

So far the dealer can't find any reason why the oil light came on (besides the obvious, the oil was low) No leaks, plugs are not fouled, PCV is good... they are now working with GMC on next steps

 

And for the kicker, after 600 miles (I was corrected by the dealer, it's closer to 600 not 800 miles since they changed the oil and started the oil consumption test) the motor was 4 Qts low... WTF

 

Now there is another issue, why didn't the oil light come on sooner?  AND, why didn't the light come on when I drove it to the dealer last week when it was 4 Qts low...

 

With this being said, we are scheduled to leave mid March on a cross country trip taking the RV to visit family for 3-4 months. I'm now pushing the dealer to replace the motor b/c I don't trust a "fix"... or what damage might have been done to this motor with less than 20k miles

 

What a mess

That must be so frustrating, heck it's frustrating to just read about.  I can't imagine having a problem like that.  I hope the dealer corrects it for you because obviously something is very very wrong.  You mentioned the plugs aren't fouled.  That confuses me big time because you would think if your engine is burning that much oil the plugs would look like hell.  I don't know.  I'm just hoping the dealer makes it right by you at the end of the day.  Especially before your big family trip!

Edited by Jettech1
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Pryme Senior Enthusiast

Pryme

Posted
Posted

4 quarts low in 600 miles? You need a new engine. That one is definitely defective. Please keep us posted. Sorry you’re dealing with this. 
 

do you notice a ton of smoke while the truck is running? 

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KARNUT Senior Enthusiast

KARNUT

Posted
Posted
37 minutes ago, Rick Schleicher said:

Oil light update...

 

So far the dealer can't find any reason why the oil light came on (besides the obvious, the oil was low) No leaks, plugs are not fouled, PCV is good... they are now working with GMC on next steps

 

And for the kicker, after 600 miles (I was corrected by the dealer, it's closer to 600 not 800 miles since they changed the oil and started the oil consumption test) the motor was 4 Qts low... WTF

 

Now there is another issue, why didn't the oil light come on sooner?  AND, why didn't the light come on when I drove it to the dealer last week when it was 4 Qts low...

 

With this being said, we are scheduled to leave mid March on a cross country trip taking the RV to visit family for 3-4 months. I'm now pushing the dealer to replace the motor b/c I don't trust a "fix"... or what damage might have been done to this motor with less than 20k miles

 

What a mess

The last post was a little confusing. Previous posts seemed to show the oil usage being consistent. If that’s the case it may be normal for your rig. Especially if that’s their position. Your cure would be a different truck. I would run it until the warranty is expired and re access. If you’re 4 qts low in 600 miles well that’s different and a big change. 

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Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

Hey again,

 

No smoke on start up or while running, at least nothing that I can see. GMC requested pics of the plugs and to check the PCV, this is where we are at

 

Originally I reported here and to the dealer, 4.5 qts in 4500 miles from my trip to the Pacific Northwest over 7 weeks back in Sept/Oct. Right after the trip is when the dealer told me this was within spec however, they agreed to the oil consumption test... Fast forward ~3 months and 600 miles after they changed the oil (the start of the oil consumption test), the oil light came on... since it was going to the dealer anyway due to hard shifting at 10-15mph and some pretty loud clunking when going into part from 4 low and backing up the trailer, we started talking about the oil light that came on a few days earlier, today is when they finally drained and measured the oil and report it was 4qts low at 600 miles...

 

This kinda speaks to things getting worse pretty quickly, they are getting me a rental car tomorrow but so far, not sure what I'm going to do with my trip

 

As for the hard shifting and the clunking when going into park after backing up in 4 low, they say that is normal, SMH

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Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
2 minutes ago, Rick Schleicher said:

Hey again,

 

No smoke on start up or while running, at least nothing that I can see. GMC requested pics of the plugs and to check the PCV, this is where we are at

 

Originally I reported here and to the dealer, 4.5 qts in 4500 miles from my trip to the Pacific Northwest over 7 weeks back in Sept/Oct. Right after the trip is when the dealer told me this was within spec however, they agreed to the oil consumption test... Fast forward ~3 months and 600 miles after they changed the oil (the start of the oil consumption test), the oil light came on... since it was going to the dealer anyway due to hard shifting at 10-15mph and some pretty loud clunking when going into part from 4 low and backing up the trailer, we started talking about the oil light that came on a few days earlier, today is when they finally drained and measured the oil and report it was 4qts low at 600 miles...

 

This kinda speaks to things getting worse pretty quickly, they are getting me a rental car tomorrow but so far, not sure what I'm going to do with my trip

 

As for the hard shifting and the clunking when going into park after backing up in 4 low, they say that is normal, SMH

Just asking is all, but do you think you can lemon law your truck?  I think I would be looking into that by now.

Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

No worries on the questions, I get where you are coming from...

 

As for lemon law, I have no clue where to start. My concern is this is the first time the dealer has seen the level being down, prior to this it was me telling them it was down 2.5 qts in 4500 miles. So does the lemon law apply here???

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
Just now, Rick Schleicher said:

No worries on the questions, I get where you are coming from...

 

As for lemon law, I have no clue where to start. My concern is this is the first time the dealer has seen the level being down, prior to this it was me telling them it was down 2.5 qts in 4500 miles. So does the lemon law apply here???

Honestly sir I have no idea.  Please research it because it may come in handy in the future for you.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
2 minutes ago, Jettech1 said:

Honestly sir I have no idea.  Please research it because it may come in handy in the future for you.

If you’re using that much oil, a new engine is the cure. 

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Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
5 minutes ago, KARNUT said:

If you’re using that much oil, a new engine is the cure. 

I totally agree @KARNUT  That oil consumption with no leaks at all....Has to be going somewhere.  Where is the question because he reports no oil burning.  Excessive blow by perhaps?  If they pull the throttle body off and look into the intake, it could be soaked with oil.  But yet it still would be burning oil when sucked by the intake valves....Very curious.  I would love to be the one tearing that engine down to find out the real problem.  Broken oil rings?  Ummmmm....I don't know but I am curious as hell.

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Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

Update:

Per GM, pickup the truck and start the consumption test new... to drive it a full tank, fill it up and immediately return it to the dealership. They sited the service bulletin to go by gals of gas not miles, even though I had a log of my fill-ups, dates, mileage... they said that wasn't enough. Dealer says it's not right but there is nothing they can do

 

As for the oil light not coming on when 4qts low, the oil light is not to be trusted and per GM, it's the customers responsibility to check the oil level. The dealer said they have a car now with a blown motor due to virtually no oil and the light never came on

 

As for the tranny, they drove it about 5 miles in all gear patterns and couldn't reproduce anything abnormal - right 5 miles should have done it

 

Because this is not my daily driver and I work from home... I now have to take it out and just burn a tank of gas just to get it back to them to continue the oil test in an attempt to get something done in time for my trip in 5 weeks

 

:(

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Pryme Senior Enthusiast

Pryme

Posted
Posted
13 minutes ago, Rick Schleicher said:

Update:

Per GM, pickup the truck and start the consumption test new... to drive it a full tank, fill it up and immediately return it to the dealership. They sited the service bulletin to go by gals of gas not miles, even though I had a log of my fill-ups, dates, mileage... they said that wasn't enough. Dealer says it's not right but there is nothing they can do

 

As for the oil light not coming on when 4qts low, the oil light is not to be trusted and per GM, it's the customers responsibility to check the oil level. The dealer said they have a car now with a blown motor due to virtually no oil and the light never came on

 

As for the tranny, they drove it about 5 miles in all gear patterns and couldn't reproduce anything abnormal - right 5 miles should have done it

 

Because this is not my daily driver and I work from home... I now have to take it out and just burn a tank of gas just to get it back to them to continue the oil test in an attempt to get something done in time for my trip in 5 weeks

 

:(

That would be very annoying at this point. Burning 36gal of gas is going to take awhile when you already know something is wrong. And of course that’s over 100.00 out of your pocket. 

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