This is a clear admission of fear and a plot to distract Wilder before the fight because Fury is SCARED !!!
...
https://www.youtube.com/watch?v=ytKNToE82m0
A side mechanic can be good for oil changes and brakes for expensive vehicles but any thing further than that may cost you more than going to the dealer.
...
https://www.youtube.com/watch?v=ZETFEx5HWGA