March 28 (Reuters) - The S&P 500 opened largely flat on Monday as oil prices fell and investors waited for more updates on Ukraine-Russia peace talks in Istanbul, while Tesla shares rose after the company said it would seek investor approval for a stock split.

The Dow Jones Industrial Average fell 28.21 points, or 0.08%, at the open to 34,833.03. The S&P 500 opened lower by 1.97 points, or 0.04%, at 4,541.09, while the Nasdaq Composite gained 7.91 points, or 0.06%, to 14,177.21 at the opening bell. (Reporting by Amruta Khandekar; Editing by Sriraj Kalluvila)