Yes, they are mechanical, and like all machines, things will/do go wrong with them. Some have more problems than others, some have less. For instance, the No. 1 rated vehicle for dependability, the Lexus, still had 124 mechanical problems per 100 vehicles. And that is the MOST reliable rated vehicle. So yes, they are machines, and mechanical things do break and/or wear out. It is called friction between moving parts.
