What was the first BMW production model to feature all-wheel drive?

The BMW 325iX was the first BMW production model to feature all-wheel drive.

It was introduced as an all-wheel-drive version of the second-generation E30 3 Series. The 325iX used a permanent four-wheel-drive system with viscous couplings, distinguishing it from the conventional rear-wheel-drive 3 Series models sold alongside it.

The 325iX was available in the E30 range during the late 1980s and early 1990s, including saloon and Touring versions in relevant markets. BMW later offered all-wheel drive in the E34 5 Series as the 525iX, but that model followed the E30 325iX rather than preceding it.

The name can also cause confusion with xDrive, BMW’s later marketing name for a more electronically controlled all-wheel-drive system. The 325iX predates xDrive by many years.