Chevron Corp's second-quarter earnings topped Wall Street estimates, the company said on Sunday, and Chief Executive Michael Wirth also signaled the number two U.S. oil company remains open to more acquisitions and to increasing shareholder distributions this year. In a rare preview of its results that coincided with the announced retirement of its finance chief, Chevron disclosed a $6 billion net profit in the quarter ended June 30. While that profit is almost half of the record profit in the same period last year, the $3.08 a share adjusted profit beat Wall Street's $2.97-a-share consensus estimate.