All this over a silly oil seal? I'm afraid of what some of you would do if you were confronted with a really serious problem, like a shoe store selling you the wrong size.
Clearly, getting all up in the dealer's grille was not effective. Perhaps Step #1 is to not do that again, unless you have a really, really, really good Step #2. Which you don't. That's the other thing that is clear.
Why not be a man and attorney up? A well written letter from an aggressive attorney might break the impasse. CC KIA Motors USA, find out who the regional or district manager is and CC them, too. A lot of dealers do not want HQ to know about these problems, as it give HQ a reason to withhold certain types of support given for good customer service.
The BBB is a formality and nothing else. Never, ever expect a thing from them and you will be fine. Yeah, the dealer should be reported but, again, it is just a formality.
Nothing gets accomplished by being all confrontational. It's almost 2010, people. Hire an attorney and let them manipulate the law in your favor. You all know the police, the judicial system, and the federal gov't are using the law against you every day. Use your energy to turn the tables. Everything else is a waste of time.