Watches vs. cars: to whom the leadership in mechanical reliability?

The balance wheel of a mechanical watch regolarly used covers almost 50.000 km per year… and with no stop!
All major watch houses suggest an overhaul of the movement each 4 or 5 years. It is thus evident that watches are expected to have a functioning reliability much stronger than cars: servicing for cars is suggested every 20.000 – 25.000 km!