O'Reilly Auto Parts carries a variety of replacement parts for different types of vehicles, including items such as break pads, filters, spark plugs and windshield wipers. It also carries automotive accessories, car products and toys such as Hot Wheels and Mattel Disney Princess dolls, as of May 2015.
The bulk of O'Reilly Auto Parts' inventory consists of replacement car and truck parts covering every aspect of the vehicles. Both physical stores and the company's website, OReillyAuto.com, organize products based on the different sections of a vehicle. For example, the Oil, Fluids and Chemicals section contains products such as motor oil, windshield wiper fluid and engine coolant.
O'Reilly Auto Parts offers a full list of its products on its website along with tools for purchasing items directly through the website. Some items qualify for direct shipping, while others are only available for in-store pickup at a specific retail location. The site also contains a tool that allows users to create and save vehicle profiles, which include detailed information about the exact year, make and model that the user owns. The site automatically references these profiles and displays only parts that are compatible with the car, eliminating the issue of purchasing incompatible parts.