Why does my car's oil light come on?

i have a 83 chevy caprice and if i drive more that 40 miles and than come to a stop the light flutters. i have checked the oil levels and have had them thecked by someone else and they can't find anything wrong. can someone help me please!!!Why does my car's oil light come on?
It is indicating low oil pressure, You DO NOT want to be driving your vehicle like this. Bring it to a honest, good mechanic asapWhy does my car's oil light come on?
If you have checked your oil and it is full, then you need to have someone check you oil sender unit, which tells the light to come on. They can go bad sometimes. If it not that then your oil pump is wearing out.
it might be the sending unit or the wire that goes to it is loose. did you check the oil? if the oil is full and you don,t hear any knocking then i would say it,s the sending unit.

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