did they say what oil to put back in it.i used to know but as i get older i seem to forget?:fing20:For whatever it's worth. I emailed TT with questions regarding oil change in my K58. They told me the to fill through vent cap too. Said it would be slow going though because fluid had to fill one chamber before it would overflow to next. Just be sure of how much you take out so you know how much to put back.