I agree about the XK8 being a beauty, but, unfortunately, Jag has only just recently begun to improve their build quality. Still nowhere near what I would call a reliable set of wheels, but an order of magnitude better than they were in the 70s, when Leyland (Jag's parent company & the GM of Britain at the time) was plagued with strikes, in-fighting between sister brands & constant battles with ever-moving US emissions/fuel effiency/safety laws (which were what ultimately killed the XKE along with many other famous British marques).
For whatever it is worth, although they tend not to spot the floor as much as Jags, Audi considers burning a quart of oil/week within specs for most of their cars.