Couple more pics. Their is a paper punch dot net to the flake to show size comparison.

 

I have noticed that in mine also.

Sub'd for info.

 

Well I do have an appointment with the dealer Tuesday. Bad thing is I noticed this right after deleting my truck I have not even pulled it out of the garage and have already installed my EFI tuning. Everything I have read is pointing to head gasket :crying:
http://www.duramaxforum.com/forum/2...2011-lml-duramax-powertrain/582338-low-coolant-warning-dic-dont-see-leak-3.html

 

I doubt its a head gasket on a new truck like that... Prob. just residual from the inside of the radiator or the hoses...

 

Is the upper radiator hose hard from sitting overnight?

Sadly, with it being deleted and tuned, if it would happen to be serious, may have to eat that one.

Most likely not though, seems unusual for a new truck to have that kind of failure.

 

the whole underside has some sort of black paint on it, but how any of it would get there I wouldn't have a clue. Is the oil good? no color change? could be gasket material, but so much and so fine (some of it).

 

I just had the dealer change the oil at 2,300 miles. The oil in the motor now has 229 miles on it but I will inspec and report back. I did call PPEI and they seem to be confident that beings the truck has yet to see any additional power and 0 miles tuned. I may still get this covered under warranty if I return to stock now. I plan to check the upper hose after a good warm up and will also report back.

 

I don't think GM will give a rats azz about what PPEI thinks, fact is your ECM has a foot print in it. Hopefully it's nothing seriuos good luck

 

GM will use anything they can to get out of paying for that, the fact that the factory tuning has been modified will be more than enough for them to tell you to pony up the cash.

 

All depends on the dealer whether or not they will warranty it. I took a tranny out of a truck with efi live on it for 60,000 miles and I got it warranted. Gm didn't even ask for a copy of the ECU.

Sent from my E6782 using Tapatalk

 

Curious as to what it was, noticed it on my buddies 15' Denali yesterday..

 

Interested to hear the outcome, but even if you return back from deleting and GM decides to hook up to that ECU, you're more than likely going to have to bite it...if it's something serious, but I'm doubting it is anything major. Good luck and let us know the result!

 

Would be very hard to believe if this is head gasket related.. Still very interested..

 

Well the dealer has ordered me a new oil cooler for my truck. Apparently GM has seen this before in a few of the new models. It will still be covered under warranty.

 

hmmmmmmmmm

 

So the oil cooler is.....somehow getting this material into the coolant?

Not sure how that happens. Did they give you any details?


sent from my Turbo 4

 

Thats where I was gettin' at....

 

I did not get any more details. I picked the truck up at closing time and was told it was safe to drive for now. It was my impression that this oil cooler had a coating or defect inside of the coolant passages that is causing the issue. The new part should arrive first of next week. After the old has been removed I will inspect and possibly take pics if i can see where the issue was. I still plan to have an oil analysis done in the next few weeks that should tell me for sure if i have a head gasket issue and this was indeed not the fix.

 

So the dealer has now pulled and replaced the oil cooler. The coating that was used inside of this one is no longer being used. Pretty obvious this was the problem.

 

Oh wow look at that.
Good catch for a dealer, they usually are just glorified parts changers.
Thanks for the follow up, I am pretty sure everyone will appreciate it.

 

This thread should be moved into the LML powertrain section. Great info for anyone with an LML! Thanks for posing this, I've checked mine and so far nothing in the coolant tank...

 

Woah... Impressive for the dealer to be on top of that. Glad they took care of it for you!

 

I am pretty relieved that it was just the oil cooler. Dealer flushed the entire coolant system and even changed the oil again to make me happy.

 

Good to hear. Good dealer that actually cares.

 

I am not sure what the TSB would be but I do know GM has seen this issue before and knew exactly what it was to fix the issue. The flakes will settle to the bottom of the tank I know that for sure. I maybe able to find my paper work if that will help anyone.

 

I'd like to have a LML, but after seeing so many goofy problems here and there, makes me glad to have a 10yr old Dmax.

Bypass oil filter and bypass coolant filter would have to go on the new truck, along with a Fass...

Heres to tunes and deletes!!!

 

It doesn't seems to be necessary to replace the oil cooler if it's just the coating. You've gotten a decent dealer nearby.

 

So the oil cooler was the cuplprit?

I had mine in and they just flushed the coolant and said wait for a TSB to come out......

 

Gonna check my coolant today but have not noticed anything. Then again, now that I know that the flakes settle to the bottom I'll go ahead and squeeze the hose to see what i can get to rise to the surface.