Okay I know this is a sin to let a Bimmer rot in this manner, but I had no control over it - my sister took the 535ia to college. But she hasn't driven it since she got there in August. I'm probably going up there to get it in the next couple of weeks - anything I should check out before I try to start it up and drive it back? I know the battery is dead, so at the very least it will need a jump start. Should any of the fluids (or anything else) be changed/inspected before I make the 500 mile drive back home? The battery went dead fairly quickly, so I suspect the car might have a loose or corroded ground cable - that's under the back seat, correct?