Crude futures settled below $30 a barrel on Friday with New York closing at $29.42, down 10.5 percent for the week, and London closing at $28.82, down 13.7 percent for the week. The global oil glut, a stronger dollar, and reports that the sanctions on Iran were about to be lifted contributed to the move. The now familiar factors of a circa 1.5 million b/d surplus in global oil production; a strong US dollar, up 20 percent since mid-2014; the Chinese economy continuing to slacken; and problems on the horizon for US growth were the main reasons behind the price slump. A couple of new concerns have arisen lately. Analysts are worried about the optimism being expressed by US shale oil producers over the likelihood of higher oil prices just ahead. Many US drillers are not trying to cut back on production but simply tying to hold things together until later this year. Another factor is reduction in demand for diesel used to drill and frack oil wells which is down by nearly 50 percent in the last 18 months. The drop in demand for diesel along with warm weather is leading to large surpluses of distillates.