I checked my coolant yesterday and found the bottle was totally empty I topped it back up and have done around 10 miles since and it has not gone down at all. I also had a good look around the radiator and hoses and there's no sign off any burnt coolant or marks from a leak. My question is would it be possible for the coolant to be completely used up? I last checked it probably 3 months ago (naughty I know). I have no idea how long it's been empty but my temp gauge has never gone above half. Any thoughts? Could it be a slow leak? Thanks alot!