O'Reilly Automotive's comparable store sales results increased by 5% for every quarter of 2014 and concluded at 6% for the entire year. Considering the previous record of last 3 quarters, undercar repairs for ride control, chassis, driveline and brakes were major contributors to its robust 6.3% comparable store sales expansion during the fourth quarter, which also surpassed the company's previous guidance of 3% to 5%.