All E23 7 Series models (with the exception of the 745i) were built with the 12-valve M30 six-cylinder engine as used in the older E3 and E9 cars.

Although most E23 engines were fuel-injected, two models (the 728 and 730) were available with a Solex four-barrel carburettor until 1979, when they were replaced by the fuel-injected 728i.

Early fuel-injected models used the Bosch L-jetronic system while later models used the more advanced digital Bosch Motronic system.

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.

Also, later models (1985-1986) offered an optional driver's air bag.

A variety of options included leather upholstery, several types of wood trim, power seats...