Every since I've owned this car I have had this broblem. The left front tire will not hold air pressure. It will lose 5psi. a month. All other tires maintain pressure. This has been going on since the car was new. After every tire rotation the same thing takes place.while the same tire on the back wheel it holds the pressure, but put it on the left front and it will lose 5 psi a month. I put a new set of Michilin at 35,000 and they do the same thing.I have never found anyone who can give me a reason for it. Can You