O'Reilly Auto Parts store #1939 in Killen, Texas carries parts, tools, and accessories. It offers services like free battery testing, wiper blade and bulb installation, Check Engine light testing, and brake rotor resurfacing. The store has a fantastic team of people. The staff is willing and happy to explain the best items for repairs and best practices. They help find the right parts for a vehicle and help resolve car issues. One employee is described as super, very cool, friendly, and amazing, providing great help and clear directions. However, a customer notes that a specific common socket was not in stock, leading to questions about quality and ethics after other experiences. Overall, many find it a super place with a great selection and prices.