I took delivery of an LS460 in June (May build). When I purchased the car I added oem chrome wheels, which were installed the day of delivery. The next morning, I checked the tire pressure on all 4, with my tire gauge--all 4 were at 33psi, per mfg specs (18" wheels). Looks like everything is fine, but I do make it a habit to manually check my tires every month (always in the morning, after the car has sat overnight, so as to get a good cold tire pressure). When the car was a month old, I checked and all tires were low. I added air to all 4 and decided they must not have seated the new tires well--or something. But, in the past month, I have checked the tires each Sunday morning--and the cold tire pressure (using the same air gauge)has decreased each week, & in every tire. After the last check, I aired all 4 up again! The loss was 2.5 lbs in 3 tires and 3 lbs in tire four. The spare's pressure has remained constant. I am in Dallas, TX, and it is hot here this time of the year. That being said, usually at the first cold snap each year I would loose tire pressure in my prior Lexus models with the tire monitors--I knew, because of the monitor. After 3 months of continued air loss, I took my car to my dealer--they remounted all 4 tires and aired them up to 36 psi. I just checked the tires and all 4 are loosing air as before (approx 1/2 lb per week). I plan to give this a couple more weeks to make sure the air loss continues--But who should I contact "Bridgestone or my Lexus dealer"?
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