EXHIBIT 99.1

O'Reilly Automotive, Inc. Reports Fourth Quarter and Full-Year 2011 Results

• Full-year comparable store sales increase of 4.6%
• Annual adjusted operating margin improves 133 bps to 14.9%
• Full-year adjusted diluted EPS increased 25% to $3.81
• 134% increase in full-year free cash flow to $791 million

SPRINGFIELD, Mo., Feb. 8, 2012 (GLOBE NEWSWIRE) -- O'Reilly Automotive, Inc. (the "Company" or "O'Reilly") (Nasdaq:ORLY), a leading retailer in the automotive aftermarket industry, today announced record revenues and earnings for its fourth quarter and year ended December 31, 2011. The results represent 19 consecutive years of comparable store sales growth and record revenue and operating income for O'Reilly since becoming a public company in April of 1993.

4^th Quarter Financial Results

Sales for the fourth quarter ended December 31, 2011, increased $81 million, or 6%, to $1.39 billion from $1.31 billion for the same period one year ago. Gross profit for the fourth quarter increased to $695 million (or 49.9% of sales) from $637 million (or 48.6% of sales) for the same period one year ago, representing an increase of 9%. Selling, general and administrative expenses ("SG&A") for the fourth quarter increased to $491 million (or 35.3% of sales) from $472 million (or 36.1% of sales) for the same period one year ago, representing an increase of 4%. Operating income for the fourth quarter increased to $207 million (or 14.9% of sales) from $164 million (or 12.5% of sales) for the same period one year ago, representing an increase of 26%.

Net income for the fourth quarter ended December 31, 2011, increased $17 million, or 16%, to $123 million (or 8.8% of sales) from $106 million (or 8.1% of sales) for the same period one year ago. Diluted earnings per common share for the fourth quarter increased 27% to $0.94 on 130 million shares versus $0.74 for the same period one year ago on 143 million shares.

The Company's results for the fourth quarter ended December 31, 2011, included nonrecurring income related to a settlement between the Securities and Exchange Commission and a former CSK Auto Corporation ("CSK") officer that resulted in the reimbursement to CSK of $3 million ($2 million, net of tax) of incentive-based compensation and stock sale profits previously received by the officer. This "clawback" amount was included in "Operating income" on the Company's Consolidated Statements of Income for the fourth quarter ended December 31, 2011. As previously announced, the Company's results for the fourth quarter ended December 31, 2010, included a nonrecurring, non-operating gain of $12 million ($7 million, net of tax) related to the settlement of a note receivable acquired in the acquisition of CSK. The note was favorably settled for a gain in the fourth quarter of 2010. The gain related to the settlement of this note receivable was included in "Other income (expense)" on the Company's Consolidated Statements of Income for the fourth quarter ended December 31, 2010. The results discussed in the paragraph below are adjusted for these nonrecurring items for the fourth quarters ended December 31, 2011 and 2010, and are reconciled in the table accompanying this release.

Adjusted operating income for the fourth quarter ended December 31, 2011, increased 24% to $204 million (or 14.7% of sales) from $164 million (or 12.5% of sales) for the same period one year ago. Adjusted net income for the fourth quarter ended December 31, 2011, increased 23%, to $121 million (or 8.7% of sales) from $99 million (or 7.5% of sales) for the same period one year ago. Adjusted diluted earnings per common share, for the fourth quarter ended December 31, 2011, increased 35% to $0.93 from $0.69 for the same period one year ago.

"We are pleased to report another quarter of solid financial results," stated Greg Henslee, CEO and Co-President of the Company. "As a result of our continued efforts to profitably grow sales, along with our culture of strict expense control, we generated a fourth quarter increase in comparable store sales of 3.3% while also increasing our adjusted operating margin to 14.7%, a 214 basis-point improvement over the fourth quarter last year. For the year, we generated a comparable store sales increase of 4.6%, and we expect to continue these strong results in 2012 with comparable store sales guidance of 3% to 6%. For the full year, we generated a record 14.9% adjusted operating margin, and we expect to achieve an operating margin of 15% in 2012, a year earlier than our 2013 goal. Our continued success is the direct result of our Team Members' commitment to providing the highest level of service to our customers every day. I want to thank Team O'Reilly for your dedication and hard work and congratulate you on another great year."

Full-Year Financial Results

Sales for the year ended December 31, 2011, increased $391 million, or 7%, to $5.79 billion from $5.40 billion for the same period one year ago. Gross profit for the year ended December 31, 2011, increased to $2.84 billion (or 49.0% of sales) from $2.62 billion (or 48.6% of sales) for the same period one year ago, representing an increase of 8%. SG&A for the year ended December 31, 2011, increased to $1.97 billion (or 34.1% of sales) from $1.89 billion (or 35.0% of sales) for the same period one year ago, representing an increase of 5%. Operating income for the year ended December 31, 2011, increased to $867 million (or 15.0% of sales) from $713 million (or 13.2% of sales) for the same period one year ago, representing an increase of 22%.

Net income for the year ended December 31, 2011, increased $88 million, or 21%, to $508 million (or 8.8% of sales) from $419 million (or 7.8% of sales) for the same period one year ago. Diluted earnings per common share for the year ended December 31, 2011, increased 26% to $3.71 on 137 million shares versus $2.95 for the same period one year ago on 142 million shares.

The Company's results for the year ended December 31, 2011, included one-time charges associated with the new financing transactions the Company completed in January of 2011, as well as the former CSK officer clawback discussed above. The one-time charges associated with the new financing transactions included a non-cash charge to write off the balance of debt issuance costs related to the Company's previous credit facility in the amount of $22 million ($13 million, net of tax) and a charge related to the termination of the Company's interest rate swap agreements in the amount of $4 million ($3 million, net of tax). The charges related to the Company's new financing transactions were included in "Other income (expense)" on the Company's Consolidated Statements of Income for the year ended December 31, 2011. The former CSK officer clawback, discussed above, was included in "Operating income" on the Company's Consolidated Statements of Income for the year ended December 31, 2011. As previously announced, the Company's results for the year ended December 31, 2010, included a charge related to the legacy United States Department of Justice ("DOJ") investigation of CSK into CSK's pre-acquisition historical accounting practices, as well as the gain related to the settlement of a note receivable acquired in the CSK acquisition discussed above. The Company accrued $21 million during 2010 in anticipation of executing a Non-Prosecution Agreement ("NPA") among the DOJ, CSK and O'Reilly and paying a one-time monetary penalty of $21 million. During the third quarter of 2011, the NPA was executed and the previously recorded, one-time $21 million penalty was paid to the DOJ on behalf of CSK. The charge related to the legacy CSK DOJ investigation was included in "Operating income" on the Company's Consolidated Statements of Income for the year ended December 31, 2010. The gain related to the settlement of the note receivable, discussed above, was included in "Other income (expense)" on the Company's Consolidated Statements of Income for the year ended December 31, 2010. The results discussed in the paragraph below are adjusted for these nonrecurring items for the years ended December 31, 2011 and 2010, and are reconciled in the table accompanying this release.

Adjusted operating income for the year ended December 31, 2011, increased 18% to $864 million (or 14.9% of sales) from $734 million (or 13.6% of sales) for the same period one year ago. Adjusted net income for the year ended December 31, 2011, increased 21% to $522 million (or 9.0% of sales) from $433 million (or 8.0% of sales) for the same period one year ago. Adjusted diluted earnings per common share for the year ended December 31, 2011, increased 25% to $3.81 from $3.05 for the same period one year ago.

Commenting on O'Reilly's full-year results, Mr. Henslee added, "We are very proud of the success we achieved in decreasing our net inventory investment by over $420 million for the year. This working capital improvement, along with lower capital expenditures during the year, generated $791 million in free cash flow. During the year, we generated significant shareholder value through our share buyback program by repurchasing over 15 million of our shares for a total investment of almost $1 billion, and we expect to continue to prudently execute our buyback program during 2012. I would like to again thank all of Team O'Reilly for their continued contribution to our Company's successes, and we look forward to the opportunities 2012 will bring."

Ted Wise, COO and Co-President stated, "During 2011, we expanded into our 39^th state, completed the acquired CSK store interior resets to the O'Reilly format, converted the CSK exterior signs to the O'Reilly Brand and opened 170 net, new stores, which increased our store count to 3,740. Our outlook for 2012 includes the continued expansion of our store base with the opening of 180 new stores along with the relocation or renovation of nearly 50 existing stores. We continue to open stores in both existing and new markets and have maintained our focus on rapidly growing professional service provider business in the western states. Our Team Members' commitment to superior service levels was the foundation for our 4.6% comparable store sales increase during 2011, which was on top of an extremely strong comparable store sales increase of 8.8% last year, and we look to continue this solid growth in 2012."

Share Repurchase Program

On January 11, 2011, the Company's Board of Directors authorized a $500 million share repurchase program. The Company's Board of Directors approved resolutions to increase the authorization under the share repurchase program by an additional $500 million on August 5, 2011, and an additional $500 million on November 16, 2011, raising the cumulative authorization under the share repurchase program to $1.5 billion. During the fourth quarter ended December 31, 2011, the Company repurchased 1.8 million shares of its common stock at an average price per share of $75.60, for a total investment of $136 million. During the year ended December 31, 2011, the Company repurchased 15.9 million shares of its common stock at an average price per share of $61.49, for a total investment of $976 million. Subsequent to the end of the fourth quarter and through the date of this release, the Company repurchased an additional 0.1 million shares of its common stock at an average price per share of $79.45, for a total investment of $10 million. As of the date of this release, the Company had approximately $514 million remaining under its share repurchase program.

4^thQuarter and Full-Year Comparable Store Sales Results

Comparable store sales are calculated based on the change in sales for stores open at least one year and exclude sales of specialty machinery, sales to independent parts stores and sales to team members. Comparable store sales increased 3.3% for the fourth quarter ended December 31, 2011, versus 9.2% for the same period one year ago. Comparable store sales increased 4.6% for the year ended December 31, 2011, versus 8.8% for the same period one year ago.

1^st Quarter and Full-Year 2012 Guidance

The table below outlines the Company's guidance for selected first quarter and full-year 2012 financial data:

Non-GAAP Information

This release contains certain financial information not derived in accordance with United States generally accepted accounting principles ("GAAP"). These items include adjusted operating income, adjusted net income, adjusted diluted earnings per common share, free cash flow, and rent-adjusted debt to adjusted earnings before interest, taxes, depreciation, amortization, stock option compensation and rent ("EBITDAR"). The Company does not, nor does it suggest investors should, consider such non-GAAP financial measures in isolation from, or as a substitute for, GAAP financial information. The Company believes that the presentation of financial results and estimates excluding the impact of the non-cash charge to write off the balance of debt issuance costs, the charge related to the termination of interest rate swap agreements, the former CSK officer clawback, the charges related to the legacy CSK DOJ investigation, the nonrecurring, non-operating gain related to the settlement of a note receivable acquired in the acquisition of CSK, as well as the presentation of adjusted debt to adjusted EBITDAR and free cash flow, provide meaningful supplemental information to both management and investors that is indicative of the Company's core operations. The Company excludes these items in judging its performance and believes this non-GAAP information is useful to investors as well. The Company has included a reconciliation of this additional information to the most comparable GAAP measure in the accompanying reconciliation table.

Earnings Conference Call Information

The Company will host a conference call on Thursday, February 9, 2012, at 10:00 a.m. central time to discuss its results as well as future expectations. Investors may listen to the conference call live on the Company's website at www.oreillyauto.com by clicking on "Investor Relations" and then "News Room". Interested analysts are invited to join our call. The dial-in number for the call is (706) 679-5789; the conference call identification number is 40239387. A replay of the call will be available on the Company's website following the conference call.

About O'Reilly Automotive, Inc.

O'Reilly Automotive, Inc. is one of the largest specialty retailers of automotive aftermarket parts, tools, supplies, equipment and accessories in the United States, serving both the do-it-yourself and professional service provider markets. Founded in 1957 by the O'Reilly family, the Company operated 3,740 stores in 39 states as of December 31, 2011.

The O'Reilly Automotive, Inc. logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=5430

Forward-Looking Statements

The Company claims the protection of the safe-harbor for forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995.  You can identify these statements by forward-looking words such as "expect," "believe," "anticipate," "should," "plan," "intend," "estimate," "project," "will" or similar words.  In addition, statements contained within this press release that are not historical facts are forward-looking statements, such as statements discussing among other things, expected growth, store development, integration and expansion strategy, business strategies, future revenues and future performance.  These forward-looking statements are based on estimates, projections, beliefs and assumptions and are not guarantees of future events and results.  Such statements are subject to risks, uncertainties and assumptions, including, but not limited to, competition, product demand, the market for auto parts, the economy in general, inflation, consumer debt levels, governmental regulations, the Company's increased debt levels, credit ratings on the Company's public debt, the Company's ability to hire and retain qualified employees, risks associated with the performance of acquired businesses such as CSK, weather, terrorist activities, war and the threat of war.  Actual results may materially differ from anticipated results described or implied in these forward-looking statements.  Please refer to the "Risk Factors" section of the annual report on Form 10-K for the year ended December 31, 2010, for additional factors that could materially affect the Company's financial performance.  The Company undertakes no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise.

CONTACT: Investor & Media Contact
         Mark Merz (417) 829-5878