Repeated flushing with the old fluid on my 2016 2SS in January @32k miles lasted about 10 months @45k miles. In October, the 1st flush of the new fluid failed and the shudder came back much worse.
The dealer flushed it a 2nd time with the new fluid and the problem is improved. At this time, I don't think the problem is completely resolved as it feels like there is a slight underlying vibration/wobble at highway speeds.
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