Hi Brandon,
I have had a late model s type 2.7D SE for over three years. The 2.7 Gemini Diesel was built as a joint project between Peugeot and Ford and is a fine piece of engineering. It is quite quick with great acceleration and belies the fact that diesels are slow and noisy. The V6 engine has twin turbo chargers, and two EGR valves, the latter needing a clean out now and then. The clean out can be achieved by a good blast on a dual carriageway, or a can of EGR cleaner costing under £10. Easy!
The Diesel Particular Filter has some horror stories, but most of them are apocryphal. I have never had a problem with mine even though I don't do a big mileage and mostly short runs. Again a drive of about half an hour when the engine is at normal operating temperature at over 40 mph will regenerate the DPF, and again there are additives that also do the job.
The engine has a cam belt which needs changing at 105,000 miles or ten years, so ask that question if the car you are thinking of buying is close to that mileage.
I get over 45 mpg on a long run, and have on one occasion returned 50.6 mpg. Driving around the city gives me on average about 35 mpg.
I use premium fuel as I think it gives me a better performance, but there are many other drivers whose cars perform well enough with standard fuel/
A good test drive will surprise you. It certainly did surprise me, even though I had has two diesels as company cars previously.
Regards,
Peter.