1999 BMW 540i Q&A

1999 BMW 540i Question: Occasionally, after driving for about a half hour or so, I hear a terrible noise

It happens when I make a turn, especially so when parking. the noise is a lot like a groan, or a moan. It is not high pitched like a squeal. After the motor is off and the car rests for a while,. the noise disappears, only to return after a day, or a week, or a month. Anyone have a clue? -
Answer 1
First check all your fluid levels. The problem with intermittent noise, it's guesss work unless it happens while checking. If I was you, i'd bring it to your local auto repair facility before it get's worse. Goodluck -