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Truston Gunter

By Truston Gunter
in 6.6L Gas V8 (L8T)

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KARNUT Senior Enthusiast

KARNUT

Posted
Posted
9 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

 

:(

The cats do a good job of masking oil burning. I had a truck use 1qt every 500 miles for 12 years. It was stroked and had a whipple S/C. It was a blast. It’s still going. I had a 98 ford that used a qt every 2500 miles. Did the test. They called it normal. At 20K miles I put a vortex S/C on it. At 130K traded it in using the same oil amount. Had a 94 Z-28 using the same amount for 130K miles and 7 years. All showed no smoke, thanks to the cats.

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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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Pryme Senior Enthusiast

Pryme

Posted
Posted

So I did my second oil change today. Put about 2,400 mi on this oil. Mobil 1 5w30 and I decided wanted to see exactly how much came out because I know I put exactly 8qts in. Well exactly 8 quarts came out to the ounce it would appear. I carefully drained it into two empty jugs and did 4qt each. Both went right to the line. 
 

now again, this is only 2,400 and I also didn’t tow anything during this period. 
 

my next oil change will be the free one you get in the first year so I’ll run this til summer. Then I will change every 5k and keep track of it. 
 

 

  • Like 2
customboss Senior Enthusiast

customboss

Posted
Posted (edited)
12 hours ago, Pryme said:

So I did my second oil change today. Put about 2,400 mi on this oil. Mobil 1 5w30 and I decided wanted to see exactly how much came out because I know I put exactly 8qts in. Well exactly 8 quarts came out to the ounce it would appear. I carefully drained it into two empty jugs and did 4qt each. Both went right to the line. 
 

now again, this is only 2,400 and I also didn’t tow anything during this period. 
 

my next oil change will be the free one you get in the first year so I’ll run this til summer. Then I will change every 5k and keep track of it. 
 

 

In a perfect world I wish you had analyzed that liquid volume to help us understand what is going on for the consuming engines.  A Gas Chromatography run for gasoline in oil volume would be helpful to you and others going forward.  The sad thing about high fuels volumes in oil is we don't know how much of that 8 qts is actually fuel.  Subjective smell is not too accurate.  

Edited by customboss
Pryme Senior Enthusiast

Pryme

Posted
Posted
2 hours ago, customboss said:

In a perfect world I wish you had analyzed that liquid volume to help us understand what is going on for the consuming engines.  A Gas Chromatography run for gasoline in oil volume would be helpful to you and others going forward.  The sad thing about high fuels volumes in oil is we don't know how much of that 8 qts is actually fuel.  Subjective smell is not too accurate.  

That would be an exceptionally perfect world because I personally wouldn’t pay to send my oil to have it analyzed. I care about taking care of my vehicles but I draw the line at sending oil in haha. 

  • Haha 1
customboss Senior Enthusiast

customboss

Posted
Posted (edited)
6 hours ago, Pryme said:

That would be an exceptionally perfect world because I personally wouldn’t pay to send my oil to have it analyzed. I care about taking care of my vehicles but I draw the line at sending oil in haha. 

If you start using oil and GM leaves you in the oil sucking lurch like they have Truston you might sing a different tune my friend.  😉

Edited by customboss
spell lurch correctly
Pryme Senior Enthusiast

Pryme

Posted
Posted
1 hour ago, customboss said:

If you start using oil and GM leaves you in the oil sucking lurch like they have Truston you might sing a different tune my friend.  😉

Yeah I won’t be too happy and feel for those guys who’s trucks are sucking down oil like a drunken sailor. 

  • Haha 1
Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
5 hours ago, Pryme said:

Yeah I won’t be too happy and feel for those guys who’s trucks are sucking down oil like a drunken sailor. 

Me too.  Having an oil burner that is not a diesel would suck big time.  If there's one thing this thread has made me do is check my oil more often.  Hell I've probably used more oil wiping the dipstick off with a non lint wipe than the engine has burned...lol....A few more checks of the oil and I might have to add some.... 🤣

  • Haha 1
Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

Well back again... Took the Truck and RV for a drive through the country side last weekend to burn a tank of gas. Very pretty with all the wild flowers, oh wait off topic

 

Took the truck back to the dealer, his first comment was, WOW, you are only getting 8.9 MPG, yeah when towing 7000 lbs... His next comment was, no oil used. GM said to bring it back after the next tank of gas. FRICK

 

My guess is they didn't top it off when the first oil consumption test was started, can't prove it but don't really have anything else to explain it

  • Like 1
Pryme Senior Enthusiast

Pryme

Posted
Posted
1 hour ago, Rick Schleicher said:

Well back again... Took the Truck and RV for a drive through the country side last weekend to burn a tank of gas. Very pretty with all the wild flowers, oh wait off topic

 

Took the truck back to the dealer, his first comment was, WOW, you are only getting 8.9 MPG, yeah when towing 7000 lbs... His next comment was, no oil used. GM said to bring it back after the next tank of gas. FRICK

 

My guess is they didn't top it off when the first oil consumption test was started, can't prove it but don't really have anything else to explain it

Same time same place for update next week then? Haha

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
1 hour ago, Rick Schleicher said:

Well back again... Took the Truck and RV for a drive through the country side last weekend to burn a tank of gas. Very pretty with all the wild flowers, oh wait off topic

 

Took the truck back to the dealer, his first comment was, WOW, you are only getting 8.9 MPG, yeah when towing 7000 lbs... His next comment was, no oil used. GM said to bring it back after the next tank of gas. FRICK

 

My guess is they didn't top it off when the first oil consumption test was started, can't prove it but don't really have anything else to explain it

That's great news.  And 8.9 towing 7k lbs is pretty darn good.  We typically get 8 to 9 towing 8k lbs so you're right in the ballpark.  Good stuff and I look forward to your next update as well!!

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
9 hours ago, Rick Schleicher said:

Well back again... Took the Truck and RV for a drive through the country side last weekend to burn a tank of gas. Very pretty with all the wild flowers, oh wait off topic

 

Took the truck back to the dealer, his first comment was, WOW, you are only getting 8.9 MPG, yeah when towing 7000 lbs... His next comment was, no oil used. GM said to bring it back after the next tank of gas. FRICK

 

My guess is they didn't top it off when the first oil consumption test was started, can't prove it but don't really have anything else to explain it

What was that about 250 miles? She’d really have to be using oil to move on the stick much.

Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

@KARNUT, GM requested an oil level check after a full tank of gas, so ~250 miles and no oil consumed

 

I just took it in for the second tank recheck and no oil consumed, so my guess is they didn't top it off after they changed it to start the oil consumption test.

 

Sucks to know that we drove around for 600 miles being very low on oil and NO Oil Light

 

I'll throw a gal of oil in the back for our trip and check it often

 

Thanks to everyone for the well wishes but for now, the dealer can't find anything wrong

  • Like 1
Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
16 minutes ago, Rick Schleicher said:

@KARNUT, GM requested an oil level check after a full tank of gas, so ~250 miles and no oil consumed

 

I just took it in for the second tank recheck and no oil consumed, so my guess is they didn't top it off after they changed it to start the oil consumption test.

 

Sucks to know that we drove around for 600 miles being very low on oil and NO Oil Light

 

I'll throw a gal of oil in the back for our trip and check it often

 

Thanks to everyone for the well wishes but for now, the dealer can't find anything wrong

I believe a lot of us thought the same thing, that it wasn't serviced correctly to begin with.  I am super happy that your engine is doing great and you are too.  Here's to the mighty 6.6l engine.  I'm so glad all is good....a happy ending for all.

BlaineBug Enthusiast

BlaineBug

Posted
Posted

I took a 1,150 mile road trip earlier this month, driving 19 hours straight only turning the motor off for fuel ups, rest stops, and a 2 hour nap.  Oil life indicator only lost 1% during that whole time from 45% to 44%.

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
8 minutes ago, BlaineBug said:

I took a 1,150 mile road trip earlier this month, driving 19 hours straight only turning the motor off for fuel ups, rest stops, and a 2 hour nap.  Oil life indicator only lost 1% during that whole time from 45% to 44%.

Now that's very interesting.  Sounds like hell for the driving but that is interesting that you only dropped 1% in oil life.

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