O'Reilly Auto Parts is known for its extensive inventory and helpful staff. Customers appreciate the polite and friendly service, especially during stressful situations like car troubles. One reviewer highlighted a positive experience with a diagnostic test, noting the staff's promptness and knowledge. Many find the prices competitive, often paying less than initial quotes. The overall customer service is described as genuine and reliable, leading to loyalty from customers who previously faced issues at other stores. O'Reilly Auto Parts aims to meet all auto parts needs efficiently and effectively.