O'Reilly Auto Parts (also known as O'Reilly Automotive) is a specialty retailer of automotive aftermarket parts, tools, supplies, equipment, and accessories. Its product line includes alternators, batteries, belts, chassis parts, engine parts, fuel pumps, hoses, filters, oil, wipers, etc. The company also provides electrical components testing and installation, fluid and battery recycling, custom paint mixing, custom-built hydraulic hoses, and other related services.