Sept. 19 - U.S. crude oil: Investors expect the Federal Reserve to remain aggressive when it raises interest rates this week, with both benchmark contracts falling nearly 2 percent last week on the strength of the dollar, which makes oil more expensive for buyers using other currencies. The dollar was little changed on the day, but posted its fourth weekly gain in five weeks. The concern is that a sharp increase in interest rates will dampen global economic growth and demand for fuel. Oil prices are still down on a weekly basis. Policy suggestions are for reference only