I have a 2004 1.8 TDCI Focus that I have had from new. It now has over 180,000 miles on the clock.
I did 30,000 miles in the first year so it gets a lot of use. I service it twice a year as filters are cheap and would highly recommend them.
In the 10 years I have fitted very few parts (list below) so have had value for money from it and am still using it for work.
Battery
Starter
Exhaust mounts
Front link arms x4 (speed humps)
Discs and pads
Water pump and belts
Tyres
4x injectors
Bulbs
Wiper relay