How do 348/355 owners as well as non-owners feel about these cars and service costs? Do you feel the charm they offer over the 360s and even 430s make the costs worth it? Not sure if I like the idea of a mechanic essentially replacing my car's motor every 15,000 miles... I trust the guys in the factory more and would rather have their assembly permanently. Just my thoughts... my problem is I love the 355 and even 348, but the majors are such a turn off.