Oil price volatility caused by U.S.-Iran war created big market winners, but for buy-and-hold investors, there are better long-term energy themes to monitor.

Oil price volatility caused by U.S.-Iran war created big market winners, but for buy-and-hold investors, there are better long-term energy themes to monitor.

War-driven supply disruptions have turned oil refining into Big Oil's biggest profit engine, but Reuters columnist Ron Bousso says the windfall may prove temporary as capacity…