I got Nissan Altima 1999 gxe. Yesteday I noticed a vibrating rattling noise at the bottom of my car, today I noticed my car tires needing pumping so I just got a car pumper but am going to pump the tires tommmorow because its really dark outside. When I came home from going out in my car I noticed the oil icon on my dash keeps flashing when I slowly stop the car, or when the car is completely stoped. Am really worried about this issuse espically the shakimg feeling at the bottom of my car could it be just the tire needs pumping or is this issuse linked to the flashing oil icon. Does the oil need changing or somthing? I noticed my steering wheel is a bit stiff too.