Message just popped up on the screen saying "oil change due" at 8,700kms but I'm pretty sure the oil change is due at 12,500kms which is 8,700 MILES. is this another setting in the computer that has not accounted for kilometres instead of miles? While I'm at it, just another quick question. Has anyone just deleted the back mufflers on a 2013 SRT8? Does it drone when in ECO mode? I want some noise but not at the expense of comfort.