Is there a set maintenance schedule to lube the sliding doors? I don't think I saw it in the manual. Do you know if dealers will do this? I remember years ago, dealers used to advertised Lube, oil, and filter as part of their service although I don't know how much lubing they did. I'm pretty sure every time I've gotten an oil change at my Kia dealer they've never lubed anything. If it's something I can do myself, what kind of lube is recommended?