The major stock indices finished mixed today, with the Dow trending down after Chevron issued a profit warning, the Wall Street Journal reports. Chevron was down 2.7% on news that a weak dollar and poor profits at refineries will cut into its second-quarter earnings. Exxon also fell 1.3%. The Dow dropped 36.65 points to close at 8,146.52. The Nasdaq rose 3.48, settling at 1,756.03, and the S&P 500 fell 3.55 to close at 879.13.