The BMW E23 is an automobile platform that was the basis for the first BMW 7 Series luxury car. Replacing the BMW E3 large sedan, the E23 was produced for ten years from 1977 to 1987 and was replaced by the BMW E32 7 Series in 1986.
   The E23 7 series cars were very upscale and sophisticated for their time. They were the first BMWs fitted with service interval indicators, a 'check control' that alerted the driver to various system faults, and complex climate control systems. On-board computers and anti-lock braking system (ABS) were optional on early models but later became standard features. A variety of options included leather upholstery, several types of wood trim, power seats, seat heaters, and power windows and mirrors. Later models were fitted with a drivers air bag. Four-speed and five-speed manual gearboxes were available (depending on the year) and an automatic transmission was also available.
   A minor styling update in 1983 affected the 'nose' of the car (the front 'kidney' grilles, valance/spoiler, bumpers etc) as well as the dashboard and instrument panels which received updates plus (in the UK) the 735i received the Motronic 3430cc engine (replacing the 3453cc) and rear suspension modifications as well as numerous other minor changes. In the US, 1984 saw the arrival of the optional 4 speed automatic transmission (replacing the 3 speed unit previously offered), upgraded wood trim above the glove compartment and on the ashtray (previously plastic in all US models), electrically adjustable power seats and larger Michelin TRX radials with special TRX wheels (later standard on all 1985-1987 735i/L7 models) on the 5 speed manual models.