Oil light on?

[87FC3Sn93CB7]

For a while now, maybe a month or so, ive had the oil light come on intermittently. For instance when i drive cross town for about 30 or so minutes in stop and go traffic the oil light comes on when im idleing. Its not a steady red light, its more of a basic flashing, warning kinda light. I changed my oil to synthetic and had the oil pan and gasket removed also. Before the second oil change i mistakenly left the oil cap off and had driven it for no more than 5 minutes or about 1/4 of a block. Lost about 1/4 to 1/2 quart of oil. It started after that incident. But when i drive outta town like about 100 to 150 miles, the light doesnt come on at all until i slow down and go from light to light. Filled with oil to the line with a lil over, no outside leaks. Im just simply befuddled, i cant seem to figure out whats causing this. Wiring, oil sender unit, oil pump, Yeh i need as much help as i can get!

[deckeda]

If you're SURE you have enough oil in there ...

My inclination is to suspect a weak oil pump, but you could first put in a new sending unit if you think there's a chance your existing one is making the light is crying wolf.

[tommi]

yea i would suspect that also, since my car also does that like if i turn
it does that sometimes.

[h22sparkle]

i think you dont have enough oil or there is a leak causing you not to have enough oil or that oil pump is about to take a dump.

[kapone]

if it hapens when you slow down (when your rpms are droping) i would think oil pump, cause that light checks for presuse not amount and your pump runs off of engine power oviosly...