The BMW 320 was a saloon car manufactured by BMW from 1937 to 1938. It replaced the 319-based BMW 329.

The 320 was built on a shortened BMW 326

BMW 326

The BMW 326 is a relatively rapid medium sized sedan produced by the Bavarian firm between 1936 and 1941, and again briefly after 1945. It had an innovative design and sold well despite its relatively high price...

 chassis and used a 326 engine with a single carburettor and an output of 45 hp. The suspension, which was carried over from the 329, consisted of an independent front suspension with a high-mounted transverse leaf spring acting as upper control arms and a conventional live axle

Live axle

A live axle, sometimes called a solid axle, is a type of beam axle suspension system that uses the driveshafts that transmit power to the wheels to connect the wheels laterally so that they move together as a unit....

 on semi-elliptic springs at the rear.

The 320 was replaced by the BMW 321

BMW 321

The BMW 321 is a compact six cylinder sedan sedan produced by the Bavarian firm between 1938 and 1941. After 1945, production resumed at the Eisenach plant: 321s were built again between approximately 1945 and 1950, probably in greater numbers than before the war.-The launch:The 321 was introduced...

in 1938.