Buick Master Six

The Buick Master Six, also known as Series 40 and Series 50 depending on wheelbase, was an automobile built by Buick from 1925 to 1928. Previously, the company manufactured the Buick Six that used the overhead valve six-cylinder 242 cubic inch engine in their high-end cars, and the four-cylinder Buick Four for its smaller, less-expensive model. The Master Six name was introduced for high-end cars sharing the GM B platform with the Oldsmobile Model 30, powered by the 255 cubic inch Buick inline-6 engine released the year before.