oil light on 1999 Ford Windstar

My oil light comes on after the engine has been running a few minutes but goes out right way and it comes on when I stop at stop light. All oil levels are good and van runs good and never hot.

1 answer
The oil pressure sender could have failed, so the pressure has to be verified by a mechanical gauge. Partially clogged pick up screen also could restrict flow, therefor causing pressure problems.
Most shop has the tester to verify the pressure.

Zee