Excessive oil consumption?

RockyLM2

New member
2
0
Year
2020
Mine is also using a little over a quart in less than two thousand miles. Waiting to see what the dealership tells me.
 

St8fan

New member
3
0
Year
2020
I was able to check mine without removing anything. There is a foam cover on top of the cam cover that blocks the label. By carefully lifting that foam a bit so I didn't rip it (I used a flat plastic piece about the size of a large popsicle stick), I was able to get my phone in there and take a picture. I was able to zoom in on the picture enough to get a look. If you look at the cam cover in that link above, you can get an idea of where the label is. It'll be on the front passenger side corner of the engine (just to the left of the oil fill cap as you look at the engine).
Thanks for this info. I was able to push the foam top back a bit with my thumb to reveal the sticker. I had burned through 5 quarts of oil while on a 5000 mile trip pulling a 7300# camper. My cam cover is not one of the ones within the date ranges of the "suspect" cam covers. Keeping a closer eye on it now. We'll see how much she burns through without towing.
 

St8fan

New member
3
0
Year
2020
Hi guys, I have a 2020 and I've recently been going through about a quart every 600-700 miles. Took it into the dealer but they reported everything looked fine (no codes, etc). So I'm currently doing an oil consumption test (having to stop in there every 500 miles...) so we'll see what that reveals. I mentioned the PCV valve as a potential issue but they said codes would be thrown if that was bad. Did the PCV valve end up fixing the consumption issue for others? Any other suggestions or bulletins anyone is aware of I could reference?
Is your rate of oil consumption of a quart every 600-700 miles while towing?
 

ACP

New member
8
5
Is your rate of oil consumption of a quart every 600-700 miles while towing?
Yes, I was using a quart every 600 miles while towing. After doing the oil consumption test over the course of 5k miles, I average a quart every 1200 miles. Apparently "within spec" for the engine is an oil consumption rate up to a quart every 1000 miles. So because I was outside that range, there is nothing further for me do other than do another consumption test if I think it's using more. The whole process has been quite frustrating for me and although I do like other aspects of the engine, using a quart every 1200 miles and GM stating that is normal for this engine has left an overall bad impression on me.
 

St8fan

New member
3
0
Year
2020
I was incorrect about the oil consumption, truck burned 5 quarts in 3000 miles. Only had two left in it.
Have there been any engine issues since the oil has been filled and maintained? Ran into a similar situation myself but everything seems fine now that the oil is at the proper level.
 

jrickett

New member
15
2
Ironically, this happened to me yesterday. Went into limp mode (reduced performance mode), while merging into traffic.
So, there was no clear indication of anything from the status message (just the reduced mode). After finishing up my errands, I limped home, plugged in my Bluedriver and it put out a "P06DD" code (Engine oil pressure control circuit performance / stuck off).
Starting with the basics, checked the oil. Oil level kept showing on the stick as nearly bone dry...... (just the tip), after adding about 2 3/4 qts, it was full again.

I last changed the oil right about 4k miles ago (been doing about every 4k miles for oil changes). I do not drive it much, however I did a road trip from Maryland to Wisconsin (1,140 miles each way, constant 18h drive each way). That is the only explanation that I can come up with, although I do not know the exact tolerances when it comes to this. I got the oil back to a full state and the check engine light cleared, limp mode disappeared, so I can only assume that it was low on oil and triggered the limp mode.

After a quick google search, typically engines running severely (like high mileage fleet vehicles) would average 2-3qts burnoff. I certainly do not have any visible leaks, either in my driveway, or when I venture out, so I do not believe that it is a leak, I do keep a close eye on this.

Perhaps this is normal if it is run hard?

One a good note, at constant highway speeds (75mph - 80mph), I could easily get 39mpg (or at least what it showed). Close to 700 mi on a full tank!
 

BoostN

Administrator
Staff member
292
46
TN
Year
2021
I noticed a member on facebook posted his dipstick was dry as well right at about 4-5K miles. I just had my first oil change, but I'm going to keep an eye on mine in about 2K to see if it's dropped any.
 

jrickett

New member
15
2
Ironically, this happened to me yesterday. Went into limp mode (reduced performance mode), while merging into traffic.
So, there was no clear indication of anything from the status message (just the reduced mode). After finishing up my errands, I limped home, plugged in my Bluedriver and it put out a "P06DD" code (Engine oil pressure control circuit performance / stuck off).
Starting with the basics, checked the oil. Oil level kept showing on the stick as nearly bone dry...... (just the tip), after adding about 2 3/4 qts, it was full again.

I last changed the oil right about 4k miles ago (been doing about every 4k miles for oil changes). I do not drive it much, however I did a road trip from Maryland to Wisconsin (1,140 miles each way, constant 18h drive each way). That is the only explanation that I can come up with, although I do not know the exact tolerances when it comes to this. I got the oil back to a full state and the check engine light cleared, limp mode disappeared, so I can only assume that it was low on oil and triggered the limp mode.

After a quick google search, typically engines running severely (like high mileage fleet vehicles) would average 2-3qts burnoff. I certainly do not have any visible leaks, either in my driveway, or when I venture out, so I do not believe that it is a leak, I do keep a close eye on this.

Perhaps this is normal if it is run hard?

One a good note, at constant highway speeds (75mph - 80mph), I could easily get 39mpg (or at least what it showed). Close to 700 mi on a full tank!
I had to reply to my own post.........

I posted on youtube on a video "known 3.0l duramax issues", he replied to my comment (much like above) and he mentioned that it seemed like alot more than oil burning. He had mentioned that GM says that 1qt per 2k miles is acceptable, unloaded, not towing or racing. He had suggested inspecting the rear main seal and if that was leaking. I had mentioned that I have no visible oil leaks at all, so it may not be the issue. He had said that *some* 2020s have had this issue.
 

RockyLM2

New member
2
0
Year
2020
Ironically, this happened to me yesterday. Went into limp mode (reduced performance mode), while merging into traffic.
So, there was no clear indication of anything from the status message (just the reduced mode). After finishing up my errands, I limped home, plugged in my Bluedriver and it put out a "P06DD" code (Engine oil pressure control circuit performance / stuck off).
Starting with the basics, checked the oil. Oil level kept showing on the stick as nearly bone dry...... (just the tip), after adding about 2 3/4 qts, it was full again.

I last changed the oil right about 4k miles ago (been doing about every 4k miles for oil changes). I do not drive it much, however I did a road trip from Maryland to Wisconsin (1,140 miles each way, constant 18h drive each way). That is the only explanation that I can come up with, although I do not know the exact tolerances when it comes to this. I got the oil back to a full state and the check engine light cleared, limp mode disappeared, so I can only assume that it was low on oil and triggered the limp mode.

After a quick google search, typically engines running severely (like high mileage fleet vehicles) would average 2-3qts burnoff. I certainly do not have any visible leaks, either in my driveway, or when I venture out, so I do not believe that it is a leak, I do keep a close eye on this.

Perhaps this is normal if it is run hard?

One a good note, at constant highway speeds (75mph - 80mph), I could easily get 39mpg (or at least what it showed). Close to 700 mi on a full tank!
Mine also seems to only happen on long trips. I'm afraid it's gonna be difficult to prove that to the dealer.
 
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