My car has a oil leak and i added a quart the other day and now the oil light is flashing and remaining lite sometimes. i checked the oil and there is actually a liitle over full in it.

Oil temperatur? and oil level should not be mistaken, the three quarts or any extra oil or fluid should be removed.
There may be a flow restriction, oil or fluid filter, bottom pan is bent, fluid is burnt and darkened, temperature sensor problem. Oil/fluid cooler problem.

Probably more than one quart low. Check for leaks, gasket failure, poor maintenance.

Yes it is safe to drive it now. But i would recheck your oil level before you drive it. As long as the oil level is where it is supposed to be, then you will be fine.

4 quarts means that youve got one serious leak and your slicking up the roads for every body... you should get out some tools and see what you can snug up to slow the leak, as for the light, your driving a cheap vehicle so what do you expect ?

could be burning it check for blue smoke out tailpipe

You must have an oil leak . And if you are looseing that much oil that fast its got to be a main bearing seal likely the rear . Get a good size peice of cardboard and put it under the vehicle near where the transmission meats the engine . Do it fast after you park it so the engine will still have some pressure and see where its leaking . You could not possibably burn that much oil in a few days no matter how worn the engine is . But the first step it to locate where its leaking from

The oil is leaking from wherever you see oil on the engine. Sometimes there can be to much oil covering the engine and it needs to be degreased. A dye can also be added to the oil that will illuminate when a dye light is used to help track down a leak. If the oil pressure switch you removed wasn't wet with oil or leaking than it wasn't bad.

It could be anything from the valve cover gaskets, cam seals, front crank seal, oil pan gasket, rear main seal or head gaskets.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I would immediately take it back to wherever you got the oil change, and at least get it documented that it was two quarts low. check under vehicle to make sure it is not still leaking. Sometimes the oil filter seal gets stuck on after the old filter is removed, then the new filter is put on and you have two gaskets, that 100% of the time do not line up correctly and leaks when engine is under power. and may not leak at idle or static. If you have a friend to go with you as a witness, make sure they put it up on the rack in front of you to check the oil filter gasket and the drain plug (bolt). If it was their fault you may have recourse if severe damage to your engine occurred. This 5.7 liter should run normal on 3 quarts, but not at all the best thing to do to your engine.

The "check engine" light has NOTHING to do with oil or oil level. There is a problem with the fuel injection, transmission or emission system with your van. Youy will need a qualified repair shop check it out and recommend repairs.

probably a pan leak ... if the head was leaking like that you would be mixing up a storm....