[RIP]

First, the last thing you want to do is run the engine with the oil light on. The light is telling you the engine may not be getting enough oil pressure to lubricate the engine components. This leads to excessive wear and short engine life.

The only way to know for sure if there is enough pressure is to connect a direct pressure gauge and verify it's within specs. If it is and you still get the light then change the sensor. Short of that, dump in a can of engine flush then change the oil and filter using the correct viscocity. Light still on? Change the sensor. Light still on? Change the pump.