| Buick Master Six | |
|---|---|
 1927 Buick Master Six Deluxe Sport Touring Car Model 55 | |
| Overview | |
| Manufacturer | Buick (General Motors) |
| Model years | 1925–1928 |
| Assembly | Buick City, Flint, Michigan, United States[1] |
| Body and chassis | |
| Class | luxury car |
| Layout | Front-engine, rear-wheel-drive[1] |
| Platform | GM B platform |
| Related | McLaughlin-Buick |
| Powertrain | |
| Engine | 255 cu in (4.2 L) Buick OHV I6 274 cu in (4.5 L) Buick OHV I6 |
| Transmission | 3-speed synchromesh manual[1] |
| Dimensions | |
| Wheelbase | 120 in (3,048 mm) 128 in (3,251 mm)[1] |
| Chronology | |
| Predecessor | Buick Six |
| Successor | Buick Series 60[1] Buick Series 80[1] Buick Series 90[1] |
The Buick Master Six, also denoted Series 40 and Series 50 based on the wheelbase used, was an automobile built by Buick from 1925 to 1928 and shared the GM B platform with the Oldsmobile Model 30. Previously, the company manufactured the Buick Six that used the overhead valve six-cylinder 242 cu in (4.0 L) engine in their high-end cars, and the Buick Four for smaller, less-expensive cars.[1] After 1924, they dropped the four-cylinder engine and designed a small six, which they called the Buick Standard Six, to replace that end of the market. They coined the name "Master Six" for the high-end cars, now powered by the 255 cu in (4.2 L) engine released the year before. The yearly changes were a result of a new business philosophy called planned obsolescence.[1]