95 lumina engine loud overnight?video included

friend's car has took a turn overnight, looking for ideas on possible issue and solution

http://youtu.be/efxuVEaNN6w

!!Caution!! sound is a bit loud
95 chevy lumina, very rough start but will start and drive and reverse but i don't my friend wants to chance driving it

Watched the video. Between the horrible microphone and the camera shake, I can't tell what's going on.

How is your oil pressure? If good, drive it and report on symptoms.