+ Is Big Oil a Safe Investment? Daniel Jennings, September 14, 2016September 14, 2016, Investing, Investment Guide, Markets, Opinions, Chevron, Exxon-Mobil, NYSE: CVX, NYSE: PBR, NYSE: XOM, Petrobras, Warren Buffett, 0 There was a time not so long ago when Big Oil was considered to be a very safe investment....