Oil pressure warning light?

I have a 2003 Ford Focus 1.6 petrol. I have noticed that after I turn off the engine and then turn the ignition back on the oil pressure warning doesn't not come on immediately like the other lights such as the battery red light. It takes a few seconds before it comes on. The oil level is ok. Why is this?

Because the oil holds pressure even with the engine off, for a little while.

May I say Thank you for paying attention to little things like that?

Motorhead as hit the nail on the head.

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