with it. check the weight of the car. it is often written on the driver's door panel. don't lift a vehicle with a jack that can't handle the weight. you might injure yourself or your property.
extend the jack fully by pumping it with no weight. if the jack is so damaged that it can't do that, then have someone pull on it as you pump. you can also open the release valve, which is located on the opposite side of the pump and pull the piston out. now you can extend the jack without any pumping. while the valve is open, check to see if there is any oil build-up. 