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.

by in Spring, TX on April 16, 2012
2 answers 6 comments
ANSWER by on April 16, 2012
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/
COMMENT by on April 17, 2012
I have a 2001 Dodge Dakota Sport 2.5L 4-Cylinder
ANSWER by on April 17, 2012
is the oil full and what grade did they use?
COMMENT by on April 17, 2012
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.
COMMENT by on April 17, 2012
SOUNDS LIKE YOU FOUND THE PROBLEM
COMMENT by on April 17, 2012
Will the knocking subside? I am worried that something has been damaged.
COMMENT by on April 17, 2012
YES YOU PROBABLY DID SOME INTERNAL ENG DAMAGE RUNNING WITH LOW OIL
COMMENT by on April 17, 2012
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.