The BMW Z4 sDrive 35iS: Are You My M-ommy?Sam Smith1/11/10 12:10pm30EditPromoteGo to permalinkThe Z4 sDrive 35iS is many things: A convertible. A hardtop. A grand touring machine that, we can only assume, does a passable imitation of a sports car. Is it an M car? No. Should you care? No.