@vcode
Here is the deal, my 2005 Yukon 6.0l has 275,000 after 20 years. Other than water pump and minor things, the engine and transmission have never been apart. I did a AWD transfer case swap due to a major leak, got a reman unit for around $650 from a good rebuild shop and swapped it myself. At this point this truck owes me nothing. Still drive it almost daily and will not think twice about taking a 12 hour round trip even with this mileage.
I will be HAPPY if my 2024 Yukon L87 makes it to 150,000 without an internal engine failure or transmission failure. I am more worried about the stupid roller lifters making it that far at this point. Overall the DFM is a weak spot, too many moving parts, too many cylinder deactivations. Once the operational count gets beyond a specific number the failure rate goes up quickly.
I do have a Range DFM disabler on the vehicle, but the lifters still seem to collapse under DFCO (Decel with Fuel Cut Off). But I often run around town in L9 as well.
These are the areas I am most worried about:
1. DFM lifters, too fragile, too many potential activations. They are a crap shoot if and when one may fail.
2. The actual roller lifters and history shows that these roller lifter tend to have problems with the needle bearings around 75-100k miles. If you catch is early you might be able to save the camshaft, if not, you will need lifters and a camshaft, not a fun or easy job. Hopefully 0W40 with molly and 4k mile oil changes will reduce this possibility.
3. Transmission, while I am proactively upgrading the valve body at my expense at 8k miles, this is to eliminate the valve body as a future problem. The rest of the transmission, I can only hope that there will be not major hard problems. I plan on changing the transmission fluid every 20k miles. This may not help any hard parts, but should help a bit.
4. I have not heard a lot of rear differential failures, but this may be a later mileage weak spot? Probably need to make numerous differential fluid changes.
Here is the deal, my 2005 Yukon 6.0l has 275,000 after 20 years. Other than water pump and minor things, the engine and transmission have never been apart. I did a AWD transfer case swap due to a major leak, got a reman unit for around $650 from a good rebuild shop and swapped it myself. At this point this truck owes me nothing. Still drive it almost daily and will not think twice about taking a 12 hour round trip even with this mileage.
I will be HAPPY if my 2024 Yukon L87 makes it to 150,000 without an internal engine failure or transmission failure. I am more worried about the stupid roller lifters making it that far at this point. Overall the DFM is a weak spot, too many moving parts, too many cylinder deactivations. Once the operational count gets beyond a specific number the failure rate goes up quickly.
I do have a Range DFM disabler on the vehicle, but the lifters still seem to collapse under DFCO (Decel with Fuel Cut Off). But I often run around town in L9 as well.
These are the areas I am most worried about:
1. DFM lifters, too fragile, too many potential activations. They are a crap shoot if and when one may fail.
2. The actual roller lifters and history shows that these roller lifter tend to have problems with the needle bearings around 75-100k miles. If you catch is early you might be able to save the camshaft, if not, you will need lifters and a camshaft, not a fun or easy job. Hopefully 0W40 with molly and 4k mile oil changes will reduce this possibility.
3. Transmission, while I am proactively upgrading the valve body at my expense at 8k miles, this is to eliminate the valve body as a future problem. The rest of the transmission, I can only hope that there will be not major hard problems. I plan on changing the transmission fluid every 20k miles. This may not help any hard parts, but should help a bit.
4. I have not heard a lot of rear differential failures, but this may be a later mileage weak spot? Probably need to make numerous differential fluid changes.
