1997 Dodge Caravan no oil getting to top of motor

The oil pump draws up the oil from a supply pan, it enters the oil filter and proceeds to the other oil passageways. The pump could have failed or the pick-up tube or screen is clogged. It may be a pump failure but I have seen the oil filter cause problems similar to this. If you just had your engine repaired, it should be re-checked, as an installation or part failure has occured. Call whomever repaired it or remove the engine oil pan to check for damage. I installed many remanufactured engines withy 3 lbs of oil pressure, barely enough to switch the oil warning lighyt offr. Sorry you have trouble, you can install a pressure gauge to be certain.