@Mathew_Boss I will throw in my two cents because having owned a fair number of KIAs and Hyundais, I have a little bit of experience with them. One problem with these vehicles is that many owners don't take very good care of them. People tend to run extended OCIs on budget oils and use the cheapest filter available.
The Sedona is a very nice vehicle, however, if you don't have its maintenance history and you experience oil consumption, you can safely assume that oil changes were never a priority for the former owner or owners.
My opinion is that you have an oil consumption issue related to engine cleanliness. One way to clean up your engine is to run Red Line Oil 5W-30 for a couple of OCIs along with a FRAM Ultra XG10855 oil filter. It's the best oil filter for your engine. If that's not an option because of cost, then go with Mobil 1 FS 5W-40 and stay with it. Mobil 1 FS 0W-40 is also a very good option. Both oils are actually recommended by Mobil for the Lamba II 3.3L engine. Add for at least two OCIs a 15oz. bottle of Lubegard Bio-Tech to take advantage of its boosted cleaning abilities. That engine can take up to 6.5 quarts of oil without any issues, so add the Lubegard on top of the 6 quarts of oil. Keep an eye on the oil consumption, you should see it go down.
If you have a startup rattle, it's coming from your CVVT solenoids. That is related to the battery. I don't know how big the battery in the Sedona is, but in my wife's Santa Fe XL it's smaller than in the Sport, so I went with an AGM battery to get rid of the rattle. THe solenoids need a solid voltage boost on startup, and if they don't get it, they rattle.
I hope that this information is helpful to you, and if you have any other questions then please don't hesitate to ask.