Leading the all–eight-cylinder Buick line for 1931 was the Series 90, with a 104-hp engine that incorporated such innovations as an oil temperature regulator to cool the engine at high speeds and warm it in cold weather, as well as thermostatically controlled radiator shutters, as found on Duesenbergs and Packards. According to historian Beverly Rae Kimes, every component of the new model was tested over hundreds of thousands of miles to ensure that it would be as durable as previous Buicks. The basic resemblance of the Series 90 to a Cadillac was no coincidence; the two shared many of the same Fisher bodies, and the introduction of the 1931 Series 90 marked the beginning of a decade-long Cadillac-Buick rivalry for high-end luxury sales.

Not surprisingly, the Series 90 is today one of the few Buicks accorded Full Classic status by the Classic Car Club of America. Its excellent road abilities make it a popular CARavan choice.

This glamorous roadster, one of only 843 built, represents the top of the Series 90 line, and arguably the most desirable body style with collectors today. An older restoration in the correct factory color scheme of Martinique Blue and black with a brown leather interior, it is equipped with wide whitewall tires on cream wire wheels, wind wings, a flying lady radiator mascot, and a covered rear-mounted trunk and rack. As a CCCA Full Classic, it would be a desirable CARavan entrant for a thrilled new owner.