Engine mount wear
The hydraulic engine mounts on BMW's front-drive-based compacts wear and collapse, bringing vibration at idle and a clunk on gear changes. One 2019 X2 owner told NHTSA the right mount collapsed and failed again about 27,000 miles after it was replaced, and parts sellers describe the same wear on the X1 and X2. How often it hits the M35i is not known.
How to check
Feel for vibration through the seat at idle in Drive, listen for a clunk when shifting between Drive and Reverse, and look for mount replacement in the records.
