I have done about 100k between my 3 525d's.

They're actually a pretty cheap car to own, the road tax on the 2.5 isn't too bad at 1220 euro if paying quarterly.

It's very light on fuel, running well it should return a long term average of 40mpg +

it's very comfortable, I still haven't remapped mine yet but it's capable in standard form.

I have OEM m5 wheels so tyres suck, usually about 900 for the 4. I get about 20k from the fronts, 10k from the rears.

You will really struggle to find a tidy one.

Budget a suspension refresh, it costs about 2.5k. mcung has itemised everything that needs doing in his thread.

Injectors will eventually go, they cost about 200 each to recondition. Manuals don't have EGR coolers or swirl flaps.

I wouldn't bother looking in Ireland.