The Series 20 was an automobile produced by Oldsmobile division of General Motors in 1909.
When the Oldsmobile Company joined General Motors in 1908, the Series 20 was one of the first examples of platform sharing that became GM's most notable business model, as it was derived from the previously established Buick brand from the Buick Model B.
[2] It was the first Oldsmobile to use numbers to identify the product, a tradition that would last until the company concluded operations in 2004.
[1] The Series 20 was equipped with a side-valve, in-line 2,704 cc four-cylinder engine developing 22 bhp.
The engine was installed in the front, driving the rear wheels through a transmission shaft.