O'Reilly Auto Parts in Mesa provides parts, tools, and accessories. The store offers services like free battery testing, wiper blade and bulb installation, Check Engine light testing, and brake rotor resurfacing. They also have a free Loaner Tool program. Staff are described as very helpful, bilingual, and providing outstanding customer service. They answer phones promptly, verify parts in stock, greet customers, and can retrieve and even install parts like a brake light for free. They are kind and patient in helping find needed items. The store is noted for sometimes having parts faster and less expensively than other places, and they almost always have what customers need in stock.