Any reason I shouldn't do this ?

[DogsBody]

I am considering buying a diesel mondeo for about £2k

This puts my in the 2001ish territory with 100 - 130k miles on the clock.

Currently spending about £260ish a month on fuel so would be nice to bring that figure down a bit by going diesel, however I'm not going to do it if there is something massively wrong with these cars.

My other consideration would be a focus (either 1.6 petrol or 1.8 TDCI)
The mondeo is the nicer/comfier car though so am leaning toward that at the moment.

Your thoughts please

 

[DogsBody]

A £2k Mondeo TDCi is a ticking time bomb ready to generate a large bill. Buy a 1.8 litre petrol one instead.

I did have my suspicion that this would be the case, what exactly is "ticking" so to speak ?
Also how does the 1.8 TDCI fair in the focus in comparrison ?

 

[DogsBody]

Current car is a written off 172, getting about 30mpg.
Got a 1.2 corsa 60 plate courtesy car at the moment and it is properly awful, I cant say a good thing about it, other than it's getting me to work at the moment.

I notice no one has commented on the focus 1.8 TDCi yet, is that not worth considering ?