Oil light remains on 5+ seconds after start up...

[200KGPGTP]

What's the dealyo?

Oil level is fine.

[91mcnasty]

Not throwing a CEL light thou?

[200KGPGTP]

Nope. And yes, the CEL works

[91mcnasty]

Weird, weak pump maybe? How many miles are on the bottom end?

[200KGPGTP]

ODO says 212,000 But then again the speedo cable was broken for ~2+ years before my ownership.

[Zanzer]

I'd hook it up to a mechanical gauge to verify pressure and see if it's actually low or just the sending unit going south. No noises, knocks, or rattles on startup?

[200KGPGTP]

No knocking but the top end is as loud as it has ever been.

[TominMO]

I'd hook it up to a mechanical gauge to verify pressure and see if it's actually low or just the sending unit going south. No noises, knocks, or rattles on startup?

Yeah, could be the sending unit. Had that happen to me on an '87 MR2, while driving in the middle of Utah, nowhere near anything. Oil pressure on the stock electrical gauge suddenly went to zero! Pulled over in a panic, checked the oil level which was fine. Started it up, OP showed good again. This happened periodically for the rest of the time I owned the car. I just ignored it. Hook up a mechanical gauge like Zanzer said, to get the real story. Might not be a bad idea to add some motor flush to the oil, so make sure the oil passages are cleaned out.

[deathegg]

I had that happen in the DeathEgg. Wasn't sure why it was coming on, but I knew that I had skipped about 2 oil and filter changes (went way too long with really dirty oil, etc). Changed the oil and filter, and voila, light went off at start up as it should. Possibly the filter was totally clogged, and oil was probably way to thick for the pump to easily pump it though the oil passages, etc.

Change oil and filter, and see what happens!

[JohnGunn]

That amount of time is just a little short of the time it takes to fill a new oil filter at first startup. There is an anti-drainback valve in the filter to keep oil from draining back to the sump. Should that fail or leak, it would behave as you describe.

Does the light come on at idle? If not, change the filter and tell us what brand it is so we can all avoid it.

[Zanzer]

No knocking but the top end is as loud as it has ever been.

That's starting to sound more like pressure or dirty lash adjusters and less like a sending unit issue. Many times if the HLAs work quietly on a regular basis but then suddenly get loud they are trying to tell you they are thirsty. +1 on the oil change and maybe add 8oz of Sea Foam with the oil in case it's just some lazy or clogged HLA's making the noise. Plus I'd still hook it up to a gauge to verify pressure just in case the pump is trying to check out on you. It's always good insurance to get a proper reading and verify you have enough pressure when it's a suspected oil pressure issue because you want to run the engine as little as possible if that is the case.