I've seen some topics lately about bad oil senders. Also senders that are not making proper contact in the block or wire will throw up a light. I think someone said that the computer has a code for a bad sender. Do a search for "oil senders" on here and also for "codes" to see how to read them.
Most of the time it's something minor rather than major. But by all means stay on the dealer to get it resolved.
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