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« Last post by M4wdFab on October 27, 2025, 12:05:20 PM »
so looks like they have identified and RPM range that produces / aggravates an engine that has either no, some, or excessive worn bearings/tolerances and or excessive valve train knock/tapping that may or may not be heard by ear, but can be measured and recorded by a knock sensor (vibration sensor) and then they have grouped the recorded data into a pass fail based on if too much damage has been done or not, and then if ok add thicker oil to help it stay ok. im sure they have a bunch of data and GM is like full force fire fighters.
they probably have fleet data that clearly explains what percent are bad, what percent make it to 50k, 100k, 150k ect and chose a best direction to cover their ass/ meet warranty requirements, or replace the engine if needed.
thats my 30 second understanding after watching the video and not researching the recall or any other related info.