O'Reilly Auto Parts store #3919 in McKinney, Texas, offers a wide range of parts, tools, and accessories, along with helpful store services such as free battery testing, wiper blade and bulb installation, fluid recycling, and check engine light testing. The store also resurfaces brake rotors and drums, and provides a free Loaner Tool program with a refundable deposit. Customers consistently praise the helpful and professional staff, highlighting positive experiences with employees who assist in selecting the right parts and provide courteous service. Notable staff members include Brennan, Harold, Dawn, and Griffin, who are often commended for their politeness, professionalism, and willingness to go above and beyond. Customers appreciate the store’s effort to help solve problems promptly, even when they are away from home, making the experience convenient and stress-free. Overall, the McKinney location is known for excellent customer service, knowledgeable staff, and a welcoming atmosphere, ensuring customers leave satisfied and confident in their repairs.