One problem related to engine noise has been reported for the 2008 BMW X5. The most recently reported issues are listed below.
While driving with the heat on, there's a burning smell that come through the vents. Continue driving with heat on long enough and despite the smell, the right side(passenger) began to smoke, so bad you cant see to drive. . . While driving and you press on the gas to accelerate, it's not a smooth transition, u cant beat a Honda. . . While driving every now and then u hear a loud screeching sound till you turn your car off. . . In stationary position with the car on, its makes loud engine running sounds. . . The car also pulls to the right. . .