Oil prices slid to fresh four-month lows Monday as a rise in the number of U.S. oil rigs fueled supply glut concerns even as weak China manufacturing activity weighed on the demand outlook. The oil-rig count in the U.S. rose by five to 664 in the latest week, according to Baker Hughes Inc. BHI -0.92 % This offset the positive impact of signs that the country’s oil production might have peaked and has begun to decline in the past two months. The supply-side concerns also rose as Iran’s oil minister said the country can increase oil production in one week after international sanctions are lifted, ANZ said in a report. In China, the Caixin manufacturing purchasing managers’ index, a gauge of nationwide manufacturing activity, fell to a two-year low of 47.8 in July, compared with 49.4 in June. Though Chinese oil imports have held steady despite a stream […]