The 90 Series Buicks produced between 1931 and 1942 are considered the most luxurious Buicks ever produced. The 1931 models are powered by a 345 cubic-inch straight 8-cylinder engine producing 104 horsepower. The base price of the cabriolet was $1,785.
The 90 and Buick's ultimately famous OHV straight-eight engines both made their debuts for 1931, but both were notably changed for 1932.
The wheelbase was increased by two inches to 134 inches, and the Series 90's long-stroke 344.8-cid engine now made 113 bhp, a gain of nine. The three-speed gearbox was improved with the addition of "Silent Second" synchromesh.