The key with a 159 / Brera diesel is to give it a good run a coupld of times a week (10 miles plus at 60mph or more) to allow the DPF to regenerate and dont short run the car.
Keep the computer display on current consumption, this way you will notice a regen when it drops, accompanied with a bassier exhaust note and the boost guage will drop like a stone when you lift off (normally it floats down) If you see this, put the car in 4th to keep the revs up above 2000rpm until its finished (signalled by the MPG returning to normal) it usually takes 10 miles/ 10 minutes, and occurs every 180 miles around town, or up to 350 miles or so if the car lives on the motorway.
Happy motoring and dont be surprised if youre nearly £100.00 filling it up!
Other than that it has fewer oddities than your oil guzzling twin spark.
If the PAS fluid is manky on pick up, ask them to change it for Tutela G1/R