98 altima oil light on and off oil level fine car restarted and

If oil pressure is LOW this vehicle has a safety feature that will prevent vehicle from starting.(check oil level before you start) Now what I wan't you to do is to have the oil pressure switch checked or changed. This may be the reason why this vehicle is not starting or it can also be that the actual oil pressure is low. To check the oil pressure of the vehicle you will need an oil pressure guage. Remove the oil pressure switch and connect guage to oil pressure hole and check oil pressure while cranking vehicle.Some pressure testers can be connected to oil filter housing either is fine. If this vehicle has low oil pressure the reasons for that are bad oil pump, clogged oil pump pick up(from lack of oil change/poor mantainence) or bad connecting rod and main bearings but this usually have a warning from before (the engine will sound loud by knocking /clicking-tapping noise) It this was happening you may need to rebuild this engine or replace it. Good luck and Thanks for using FIX YA

OK theres a oil presure relese valve under the oil pan.
pull out the spring, undo the top oil filter and blow compressed air thou the hole where the presure release valve is. This fixed my issuus with oil lire flickering and ow oil oresure. Make sure u hit bottom of oil pan out with a hamper just in case its bent in to mutch. Fixed mine!