Had an investor bought $2,575 of O'Reilly Automotive (ORLY 0.90%) at its initial public offering in 1993, they would have become a millionaire three decades later. This track record alone is enough to catch most investors' attention. But the auto parts retailer has several other compelling factors that should keep it humming along far into the future. That includes top-tier profitability, a robust stock buyback history, and the potential for continued expansion into Canada and Mexico.For all these reasons, ...