The first cars were the 728, 730 and the 733i with the advanced Bosch fuel injection. The 732i was sold from 1980-83 and was replaced by the 735i. The 728 and 730 were discontinued in 1979 and replaced for three years by the 728i.
In spring 1980, the E23 added power locks, electric windows and tinted glass. The 735i gained a headlamp washer and wiper. In 1981, the five speed manual gearbox replaced the four speed unit as standard. The BMW service indicator board first appeared on this model, and ABS was available as an option. In 1982 the four speed overdrive automatic gearbox was introduced as an option and there was a new front spoiler.
All E23s were based on the M30 "big six" engine. All were 12 valve units except the South African version of the 735i. The 728 and 730 were the only non fuel-injection engine models. ABS was an option on early cars, not standard equipment.
Early cars only had a 4 speed manual gearbox or a three speed automatic. Later versions had a 4 speed automatic with overdrive. The L7 was a luxury version available only in the US with an automatic transmission. This car had a leather head lining, leather door skins, leather dashboard, etc.
more info on the E23
The E23 7 series was introduced in 1977. It was available as 4 door sedan.
There were three models available wich all had the M30 six cylinder engine.
These were the 728, 730 and 733i. The 728 had 170 HP and the 730 184 HP.
The 733i with fuel injection had 197 HP. All models received check control.
In 1979 the 728 was replaced with a 728i with fuel injection and 184 HP.
A 732i with 197 HP replaced the 730 and the 735i replaced the 733i.
In 1983 BMW introduced the 745i with 252 HP and a top speed of 225 km/h.
All models received a small face lift wich included new black plastic mirrors.
The three speed automatic transmission was replaced by a four speed and
all models received a service indicator and an ABS brake system as standard.
In 1986 BMW introduced a new 7 series so the E23 went out of production.