ZR0 problems

[Fossil Fool]

I am think of purchasing a 2025 Yukon Denali with the 3.0 Duramax and have concerns about the coolant and oil leak problems that have been reported. I talked to a GMC service manager /friend and he said that the leak issues have been an ongoing problem with the ZR0. He also mentioned that GM will likely drop the baby diesel altogether in the near future. Any thoughts or experiences with this engine?

 

[Stbentoak]

He must have his head in the sand because the petrol models have had 10 times the problems that the Duramax's have. I neither would take this guy's advice nor use him for service....

 

[Fossil Fool]

He must have his head in the sand because the petrol models have had 10 times the problems that the Duramax's have. I neither would take this guy's advice nor use him for service....

I asked him how the problems compare in magnitude to the gasoline engines. He acknowledged that the ZR0 is much more reliable than the gasoline powered models. He just said that they still are getting ZR0 vehicles in weekly with the oil and coolant leaks while under warranty.
I will still get one and hope for no leaks.

 

[Jay P Wy]

What's a ZR0? The 3l diesel has 2 RPO codes, LM2 (1st gen) & LZ0 (current gen). As stated above the diesel hasn't had near the issues of the V8 gas engines with all their lifter issues due to the AFM/DFM. If the service guy can't even correctly identify the 3l diesel I sure wouldn't trust him for any service.

 

[tooleyondeck]

I don't know if the LZ0 has existed long enough for anyone to attest to its reliability.

If reliability is your main concern, find a 6.2L model and have the DFM mechanically deleted and the auto stop/start disabled. That's about as reliable of a modern setup you're going to find. 99.999% of buyers aren't willing to do that though, especially with these inflated prices on the new models.