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That warning triangle is accompanied with virtually every message on the info center, so it's typically nothing (extra) to be worried about. If you said you did the oil change, the message is still there, something may not be quite right ... Did you check for leaks or anything?
Just hold it for a while until it dissapears. If all else fails, swing it by your local dealer and have the service rep just simply show you how to do it and you can be on your way in 2 minutes (this service should be free, as it doesn't cost them any of their mechanical time).