The Buick Master Six was an automobile built by Buick from 1925 to 1928. Before then,
Buick was using the six-cylinder 242 engine in their high-end cars and a four-cylinder engine
in their smaller, less-expensive cars, but for 1925, they dropped the four-cylinder engine and
designed a small six, which they called the Standard 6, to replace that end of the market. They
coined the name Master Six for the high-end cars, now powered by the 255 engine released
the year before.
The Master Six was Buicks high-end offering, above the Standard Six. It was also
manufactured from knock-down kits at GMs short-lived Japanese factory at Osaka Assembly
in Osaka, Japan. It was an all-new platform joining the smaller Model 10, and was replaced
by the Buick Series 50, and the Buick Series 60.