As a driver we have had several cars approach 300,000 miles - one in particular was "Green bean" a green fiesta...
Its not in service anymore - got sold off. Final mileage was over 304,000 miles (not km)
The list of service done to it is not around anymore but I can tell you that it was original motor and there was considerable levels of belt and part changes; ALT Battery and timing along with Serpentine belt changes. I drove it as one of my first efforts in being for being a delivery driver for employment.
So it is possible