Grand Am oil light was on, checked oil and added a quart. Oil light is still on despite the oil being at the proper level

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.

if he level is good the sensor is dirty or bad or the wires fell off

are you sure its level alert and not low pressure.
the operators guide tells you this, lost that?
get one.
low oil pressure is bad news
check it with real gauges. at the sender ,port , not guess.

Buy six and put in four, start vehicle and let run for ten seconds and shut off. Check dipstick and add oil as needed to get oil to proper level.

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They may have added too much oil -- a 2004 MB ml350 with a 3.7L engine should take only 8.5 Quarts (including what goes in the oil filter) -- Exactly 8.5 Quarts, no more, no less. You may be able do check the oil level by using the onboard computer - pushing the buttons on the steering wheel - follow the directions in the owners manual on how to check the oil level.

If the noise gets louder with the engine rpm's, it is probably a lifter tapping. I would check the oil level. If it in low ( 2 or more quarts) you may be lucky and adding oil to the proper level may eliminate the noise. Good luck Dano

first I would put in the proper amount of oil, once you are sure the level is full and if the light still comes on, pull the wire from the oil pressure sending unit, the light should go off with key on, if the light goes off then the sensor is bad. replace sensor

OK, now you added 2 quarts of oil just because someone told you to. Did you check the oil level yourself? That is very suspicious unless your engine is smoking and burning oil. Park the car on a level surface, shut the engine off, and after 30 minutes remove the dip stick and check the oil level. You may find it is overfull. If it is that is just as bad as unde-full. In any case, Change the oil & filter and use a quality filter such as Purolator or Wix and the correct weight oil which will probably be 5w20. Check your owner's manual to be sure. If the oil light is still on, have a oil pressure test run. You may have nothing more than a bad oil pressure sending unit.

The van must be on level ground while checking. after adding the correct amount of oil making sure to prime the oil filter before installing run the van for approx 30 seconds turn off and recheck after 1 min.

Nowdays 1 Qt. in 3000 miles, really isn't that bad, even some new vehicles claim that's normal. I know with my current vehicles, both at approx. 150,000-160,000 miles, they won't use any for first while after an oil change, but then after mileage starts adding up again, they start to use a little, approx.I Qt, every 1000 miles or so, until it's changed again. I've switched to the high mileage oil, just for piece of mind, as they say it revives seals, and has added protection for the higher mileage engines.This time around I'm thinking of adding "Lucas" & see how it works, as I've heard some pretty good reports on it, just to see if it will prolong that oil breakdown, at mid change.