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I have a 2016 /A8 when around 20000 miles it began to vibrate like a shudder feeling. I contacted GM and found a tech notice sent out in early 2019. It included most everything including pickup trucks with the A8 transmission. 55 GAL barrels of a new formula transmission fluid and a special pump to remove the old fluid was sent to most every dealer in America. I called my dealer and he still has the barrel and pump he was sent. They replaced the old fluid with the new and after btween 150-200 miles the vibration went away. This is a no charge type of service. GM pays the bill