What could be causing a constant knocking /rattling noise coming from my engine? on 2001 Dodge Dakota

The knocking /rattling noise happens from start up, when idle and when I accelerate. It was not that loud at first but it has started to get louder. I noticed it about a month and half ago after an oil change.

Asked by for the 2001 Dodge Dakota
2 answers 6 comments
i suggest you get a car diagnostic tool check your engine,
which one to get, it depends on your car model and year
http://www.chinasinoy.com/wholesale/car-diagnostic-tools/
I have a 2001 Dodge Dakota Sport 2.5L 4-Cylinder
is the oil full and what grade did they use?
The oil is full now, I checked it yesterday and there was barely no oil. They used Valvoline 5W-30, I put in about 3 qts. of Pennzoil 10W-30.
SOUNDS LIKE YOU FOUND THE PROBLEM
Will the knocking subside? I am worried that something has been damaged.
YES YOU PROBABLY DID SOME INTERNAL ENG DAMAGE RUNNING WITH LOW OIL
Thank you for your responses, I appreciate the feedback. The oil light never came on and there was still oil pressure. It will be a few weeks before I can get it to a garage. Will I be causing further damage by driving it, please forgive me as I am not very knowledgeable when it comes to vehicles.