I don't think they do oiled filters for cabin air filters, they just put their name on regular paper cabin air filters so they can have more money charged for them.You want an oiled filter inside your car?
As for the engine air filters, to each their own but there is plenty of testing on youtube that shows that yes technically more air flows through a K&N but also so does more dust/dirt/particles. The filter that comes with the car could happily flow enough air to satisfy a V8 engine, air intake is not a choke point for this particular motor but folks can do as they wish. I hope you don't frequent any dusty dirt roads, cuz some of that dust is going through with K&N, tested and proven many times over. Absolutely no leg to stand on from the environmental impact side of it, as others pointed out.
This is why I justify buying cars brand new. Its a hard sell to put up all that money and watch the value plummet the second I drive off the lot, but at least I know what I'm getting hasn't been damaged or incurred extra wear because "owners know better than the engineers" when it comes to air filters, oil weights and oil additives, etc etc.