Oldsmobile Series 20

The Oldsmobile Series 20 was an automobile produced by the 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 Four. The Series 20 effectively replaced the Model F, also known as the Curved-Dash Oldsmobile, and was replaced by the 1914 Oldsmobile Model 42 Baby Olds. It was the first Oldsmobile to use numbers to identify the product.