High Quality Content by WIKIPEDIA articles! The BMW 1 Series (E81/E87 and E82/E88 models) is an entry level sports car produced by the German automaker BMW since 2004. The 1 Series is unusual in its class as it features rear-wheel drive, 50:50 weight balance, a longitudinally-mounted engine and an advanced aluminum multilink suspension. It is currently BMW`s second best-selling automobile worldwide, accounting for nearly one-fifth of the total sales in 2008.