
Originally Posted by
oj88
Well, my first question would be, where is the leak coming from? There are three likely places where it could come from; Oil drain plug, oil filter, and oil filler cap. Of course there are other sources of leaks like the main seals, gaskets, etc. But since the last work done on your car was an oil change (probably includes changing the oil filter), the former three sources are the likely culprits.
The noise you hear is probably due to the low oil level and/or pressure. Engine oils, among its other jobs, provides a cushion between metal parts that damps most of the clattering noise given off by the engine. There's usually no lasting damage if the car was only driven for a few Km with a low oil level.