DETROIT — Maxima is many things to Nissan. It is Nissan’s longest running, continuously offered nameplate, and the leading large V6-powered sedan (in terms of retail sales) in the U.S. Though referred to as Nissan’s “4-Door Sports Car” (4DSC), it competes with a variety of plain and sporting sedans; everything from the Acura TLX, Audi A4 2.0T, BMW 328i, and Lexus IS to the Buick Lacrosse, Chevy Impala, Chrysler 300, Ford Taurus, and Toyota Avalon.