Your Delaware, OH O'Reilly Auto Parts store is one of over 6,000 O'Reilly Auto Parts stores throughout the U.S. We carry all the parts, tools and accessories you need, as well as offering free Store Services like battery testing, wiper blade & bulb installation, check engine light testing and more. Need help? Stop by and talk to one of our Parts Professionals today. At O'Reilly Auto Parts, we are committed to help you get the job done right and save money in the process. Our current ad includes all our latest deals, and you can find more ways to save on parts, tools and supplies by checking out our coupons & promotions, rebates and loyalty rewards. O'Reilly Auto Parts: Better Parts, Better Prices, Every Day!