No need. Your answer is right in the order guide footnote for the LZ0 and High Country trim:
Vehicle Order Guide
3. Not available with (UKL) Super Cruise or (ATT) second row power 60/40 split-folding bench seats. 2WD models not available with (PCU) Sun and Tow Package, (PDG) Technology and Entertainment Package or (PDM) High Country Deluxe.
Also. MHS is the wrong 10 speed RPO. MHS is 5.3 and 6.2 only.
3.0 Duramax is paired with RPO code MQC 10 speed only.
They won't until the redesign. The current Yukon launched for 2021, refreshed for 2025 so its probably 2028 or 2029 for the next generation with updated engines. Unless GM has plans otherwise.
They put more strain on your suspension components basically and if not installed correctly have potential of completely failing (breaking off the studs). This is just what I’ve read for years on forums and what I found from a simply google search.
They can speak the truth ( and for arguments sake lets say they are speaking the truth based off of real data they have generated by UOA's and dyno data etc ) and inform those interested in their efforts such as us being remotely interested in what goes on under the hood so to speak. And their own gain as in the ones producing the videos, often comes down to money gained from viewership or in a round about way by prompting their business and expertise. Besides, it was GM themselves that came out with the technical bulletin to have owners of certain years of 6.2 engine to come to the dealership for a pico test of the engine and if it passed that then the engine was "officially" given the stamp of approval to switch over to the new warranty approved use of 0W-40 oil. GM could easily have just done the pico test ( or do nothing and pretend there was no problem with the engines ) and sent them back out the door and never utter the words 0W-40 relative to the 6.2, to ever see the light of day but they did ...
Of course in Lake Speeds situation I imagine its a lot of dollars out of his own gained funds from youtube ( and he clearly states that as well ) that he turns around and puts back into paying these specialty oil testing facilities to conduct testing to come up with results from such testing. But at the end of the day the percentage of the driving public that see these videos are probably fairly small, no different then a forum like this as only so many GM owners have any interest in reading posts on a GM forum.
Makes me wonder what motivates these so-called experts (in their own minds) to make all these videos against 0W-20 Oils? They will never change OEM's from recommending it. Got to be making $$ somewhere from these crusades?
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