I have a 2005 Ford Taurus; The "low oil pressure light" comes only when I stop. on 2005 Ford Taurus

3.0 liter engine; 6 cylinder

Asked by for the 2005 Ford Taurus
Assuming the car has regular oil changes(and plenty of oil now).Prolonged driving with old oil may result in a clogged oil pickup in the motor.Labor intensive to correct if that's the case,not to mention possible engine damage.
The other culprit may be a defective sending unit.