Tire Air Leak

[matt]

Good Day i have a 2008 mazda 6 17 inch alloy wheels. I started to have this problem as of last year. any time the temperature dips below -2, my front left tire starts to lose pressure. I took it to mazda after it started to happen daily when it was below -2 or so. They couldnt find the problem. Spring and summer comes. No problem. a few weeks ago when it went below -2 or so. It starts to lose air pressure. I have to go to the gas station and pump it up back to 32 psi or so. The pressure always drops to 25-26 psi. Never more or less. Two weeks ago, I got brand new tires. so i know its not the tires. I am thinking its the rim. anybody had this experience before ?