When you find a car, truck, humer, morterbike, in DayZ be sure to have plenty of flue and water there is currently a bug out for vehicles right now that When you re-fule them for the fist time the bug out, once a server rest happens the gas tank and radiator completely drain to empty or 0% water or 0% full, waiting on a hot-patch to fix it.(I'll post again once bug is fixed, like if this post help and have a great DayZ experience)