I still have the cra**y original valve stems on my '06 GT. I have to check tire pressure every 2-4 weeks because I usually loose about 3-5 psi in this time. But that happens only on 2 out of 4 wheels.
But next week the stock tires (got 40K miles out of them) will be replaced with as new set of Michelin Pilot Sport AS - thats when I will also replace the valve stems...
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