Typically how long does an oil pressure switch last for a 2000 chevy malibu

Oil pressure switches have about the same life expectancy on all vehicles (about 5 yrs). They are screwed into an oil passage. When the engine is under pressure, oil pushes against a diaphragm (or flexible partition) inside the switch. As long as the oil is pushing against the diaphragm, it prevents the metal electrical contact on it from making contact with its inner base, which would complete the circuit to the oil light. When the diaphragm leaks, oil seeps through the outer housing of the switch. As the oil seeps through, it doesn't maintain the pressure required to keep the light out (especially at idle), causing the light to sometimes flicker. It will also create oil leaks.