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Add engine oil!!!

Truston Gunter

By Truston Gunter
in 6.6L Gas V8 (L8T)

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newdude Senior Enthusiast

newdude

Posted
Posted
9 hours ago, ShotgunZ71 said:

 

Shew, newdude! I had to re-read the quoted post a few times until I realized your 257mi was a typo. You meant gallons, I see. I was thinking no way in the world is 1 qt/257mi acceptable for any engine. 😁

 

 

Fixed it LOL.

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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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Flatus Enthusiast

Flatus

Posted
Posted

I don't understand how this oil consumption can be considered acceptable. Why do some burn oil and some do not? I am due for my second oil change right now which is a 5000 mile interval for me. I have towed my travel trailer for about 2500 miles of those 5000 miles. I check my oil regularly including today and it has not burned any oil in 5000 miles. I currently have 8300 miles on it. I had first oil changed at 3300 miles.

Pryme Senior Enthusiast

Pryme

Posted
Posted
34 minutes ago, Flatus said:

I don't understand how this oil consumption can be considered acceptable. Why do some burn oil and some do not? I am due for my second oil change right now which is a 5000 mile interval for me. I have towed my travel trailer for about 2500 miles of those 5000 miles. I check my oil regularly including today and it has not burned any oil in 5000 miles. I currently have 8300 miles on it. I had first oil changed at 3300 miles.

Do you tow at like 80mph? If you’re conservative I’m sure it will be fine. If you drive like a banshee, she might use some oil 

Flatus Enthusiast

Flatus

Posted
Posted
56 minutes ago, Pryme said:

Do you tow at like 80mph? If you’re conservative I’m sure it will be fine. If you drive like a banshee, she might use some oil 

I tow with cruise set at 65 mph. I rarely ever go over 65. I use tow/haul mode. Transmission stays in 5th most of the time with downshifts to 4th going uphill. 

  • Like 1
KARNUT Senior Enthusiast

KARNUT

Posted
Posted

Pulling rigs gas or diesel don’t use oil as a rule. My earliest pulling rigs were gas and lived at 3K rpm’s all day long. My diesels at maximum rpms at the speed limit in direct drive. Never in overdrive. There’re built for it. Today’s engines have more HP and TQ and can pull at lower RPMs and higher speeds. Oil usage is a different problem. Some cases nothing to worry about. If it is it will get worse, no matter what you do. Keep the dealer informed in case it does.

  • Like 1
Pryme Senior Enthusiast

Pryme

Posted
Posted
4 hours ago, Flatus said:

I tow with cruise set at 65 mph. I rarely ever go over 65. I use tow/haul mode. Transmission stays in 5th most of the time with downshifts to 4th going uphill. 

Yeah you drive sensible. Some people hammer it down hard and tow at 80. Bigger chance to burn oil doing that. 

  • Like 1
Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted

I picked up the truck yesterday, new oil change to start a consumption test, was told, don't remove the dip stick or the oil cap...talked to them again about what is acceptable. He told me, 1 qt/1k miles, I asked about miles vs. gals and he again said it's based on miles.

 

He then stated that GM will very likely say 2.5 qts in 4500 miles is within specs, however, it's up to GMC

 

Next I asked about why the oil light didn't even come on at 2.5 qts low, he said on this truck, it needs to be 3 qts low for the light to come on, to me, that's also BS

 

Oh well, consumption test started, I won't be doing much towing until Mar when we head back to Tennessee, then the miles will rack up quickly

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
16 hours ago, Rick Schleicher said:

I picked up the truck yesterday, new oil change to start a consumption test, was told, don't remove the dip stick or the oil cap...talked to them again about what is acceptable. He told me, 1 qt/1k miles, I asked about miles vs. gals and he again said it's based on miles.

 

 

 

They are wrong.  Tell them to pull up bulletin 03-06-01-023F  and to do the test properly.  Has a worksheet and everything for them to use to document.  

 

Quote

03-06-01-023F: Higher Than Expected Oil Consumption at 8600 GVW and Above - (Aug 26, 2022)

 

The accepted rate of oil consumption for gasoline engines in vehicles at or above 8600 GVW is 0.946 liter (1 qt) within 379 liters (100 gallons) of fuel used. This rate only applies to vehicles under warranty, maintained in accordance with the appropriate maintenance schedule, driven at legal speeds and within design intent of the vehicle. 

 

 

Here are the measurement instructions:

 

Measurement of Oil Consumption

 

Engines require a period of time to BREAK IN so that moving parts are properly seated. Therefore, oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time. During initial engine break-in periods before the first oil change, oil consumption may exceed 1.9 liters (2 quarts) or more per 379 liters (100 gallons) of fuel used.

 

Verify that the engine has no external leaks. Repair as necessary.

Begin oil consumption test after next regularly scheduled oil and filter change. Oil changes should not be performed during the test.

 

Verify that the engine is at normal operating temperature (see Owner's Manual or Service Manual).

Park the vehicle on a level surface.

 

Wait at least 15 minutes, after the engine is shut off, before checking the oil level to make sure that most of the oil has had time to drain back into the crankcase.

 

Verify that the oil level is at, but not above, the full mark on the dipstick and that the proper viscosity and quality oil are being used as recommended in the Owner's Manual.

Dealer should record the vehicle mileage, date and engine hours at the start of the test on the form included in this bulletin.

 

Ask the customer to verify and record the date, odometer, oil level, fuel added, and engine hours, each time the vehicle is fueled, following steps 3-5 and return the vehicle to the dealership if the oil level is found at or below the add mark, 0.946 liter (1 qt) low, if possible. The dealer will add oil to return the oil level to full. If the oil level remains above the add mark, the customer should continue to operate the vehicle and verify the engine oil level until either the oil level drops to or below the add mark or at least 4800 km (3000 mi) has accumulated since the test began before returning to the dealership for a final evaluation.

 

If the final evaluation shows that the engine uses more than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, follow the published symptom diagnostics as described in the appropriate Service Manual. If the oil consumption test shows that the engine uses less than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, explain to the customer that their engine meets the guidelines for oil consumption.

Edited by newdude
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Rick Schleicher Enthusiast

Rick Schleicher

Posted
Posted
On 11/18/2022 at 1:08 PM, newdude said:

 

 

They are wrong.  Tell them to pull up bulletin 03-06-01-023F  and to do the test properly.  Has a worksheet and everything for them to use to document.  

 

 

 

Here are the measurement instructions:

 

Measurement of Oil Consumption

 

Engines require a period of time to BREAK IN so that moving parts are properly seated. Therefore, oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time. During initial engine break-in periods before the first oil change, oil consumption may exceed 1.9 liters (2 quarts) or more per 379 liters (100 gallons) of fuel used.

 

Verify that the engine has no external leaks. Repair as necessary.

Begin oil consumption test after next regularly scheduled oil and filter change. Oil changes should not be performed during the test.

 

Verify that the engine is at normal operating temperature (see Owner's Manual or Service Manual).

Park the vehicle on a level surface.

 

Wait at least 15 minutes, after the engine is shut off, before checking the oil level to make sure that most of the oil has had time to drain back into the crankcase.

 

Verify that the oil level is at, but not above, the full mark on the dipstick and that the proper viscosity and quality oil are being used as recommended in the Owner's Manual.

Dealer should record the vehicle mileage, date and engine hours at the start of the test on the form included in this bulletin.

 

Ask the customer to verify and record the date, odometer, oil level, fuel added, and engine hours, each time the vehicle is fueled, following steps 3-5 and return the vehicle to the dealership if the oil level is found at or below the add mark, 0.946 liter (1 qt) low, if possible. The dealer will add oil to return the oil level to full. If the oil level remains above the add mark, the customer should continue to operate the vehicle and verify the engine oil level until either the oil level drops to or below the add mark or at least 4800 km (3000 mi) has accumulated since the test began before returning to the dealership for a final evaluation.

 

If the final evaluation shows that the engine uses more than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, follow the published symptom diagnostics as described in the appropriate Service Manual. If the oil consumption test shows that the engine uses less than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, explain to the customer that their engine meets the guidelines for oil consumption.

Well clearly I wasn't asked to do anything between 1k mile visits. In fact, he told me several time to not remove the dip stick or the oil cap, do not add oil, just come in every 1k miles.

 

I'm not liking where I think this will end up, only time will tell

 

Rick

  • 1 month later...
Antny Enthusiast

Antny

Posted
Posted (edited)
On 12/15/2021 at 8:05 AM, Truston Gunter said:

The truck alerted me that I needed to add engine oil! The oil life indicator is at 21%. Current mileage is 18,791. The last oil change was done at 13,217. Since the last oil change I have used 700 gallons of fuel. I read a bulletin that oil consumption is based on fuel use. There's no way 1 qt of oil per 100 gal of fuel is "normal" (service bulletin 03-06-01-023D). While I'm not overly concerned, I've just never had to add oil to a vehicle before as I'm pretty ****** about preventative maintenance. I assume my recent road trip pulling a camper is the cause but it took 2 quarts of oil to read full. Any thoughts and/or comments would be greatly appreciated. 

I have a 2021 6.6L Gas 2500HD. It's burning 1Qt per 5,000 miles, whether or not pulling/hauling 6,000 pounds (Loaded Camper & Truck). I've got 15,900 miles on it now. I do my own oil changes. I go through 8.5Qt Full Syn with GM filter per change every 5,000 miles. 

20221108_104532.jpg

Edited by Antny
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Pryme Senior Enthusiast

Pryme

Posted
Posted
59 minutes ago, Antny said:

I have a 2021 6.6L Gas 2500HD. It's burning 1Qt per 5,000 miles, whether or not pulling/hauling 6,000 pounds (Loaded Camper & Truck). I've got 15,900 miles on it now. I do my own oil changes. I go through 8.5Qt Full Syn with GM filter per change every 5,000 miles. 

20221108_104532.jpg

Truck takes 8qts so wouldn’t it be a half quart?

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
20 minutes ago, Pryme said:

Truck takes 8qts so wouldn’t it be a half quart?

That's a little confusing.  I'm not sure he stated that right.  

Dr1ft3r Enthusiast

Dr1ft3r

Posted
Posted
On 11/16/2022 at 9:51 PM, Pryme said:

Yeah you drive sensible. Some people hammer it down hard and tow at 80. Bigger chance to burn oil doing that. 

 

In my experience this is a big factor on Direct Injection engines. My last sports car had a DI engine and the people who tracked them ran catch cans and used a lot of oil. Our cars held 10 quarts and they would lose at least 1 quart of oil in one day at the track. I did not track my car and was only a quart low 1 time in 5 years. The car would pop a warning message on the dash when it got around 1 quart low. Be easy on your truck and it likely will not use much oil.

  • Like 1
nocturnalmotors Enthusiast

nocturnalmotors

Posted
Posted (edited)
18 hours ago, Antny said:

I have a 2021 6.6L Gas 2500HD. It's burning 1Qt per 5,000 miles, whether or not pulling/hauling 6,000 pounds (Loaded Camper & Truck). I've got 15,900 miles on it now. I do my own oil changes. I go through 8.5Qt Full Syn with GM filter per change every 5,000 miles. 

20221108_104532.jpg

Same. Using Valvoline Dexos 1 Gen 3 and AC Delco filter. Almost 20k miles. It's my daily driver so mostly not towing. I tow a 7k lb. Ice Castle RV trailer less than a dozen times a year.

Edited by nocturnalmotors

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