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Tire keeps losing pressure
I've observed one wheel/tire constantly losing pressure over the past several weeks on my 2014 Touring 19" OE wheels. This set of Kumho LX tires have just over 20,000 miles on them. I've taken the car back to the shop that originally mounted them and that also does my rotations and balances. They've taken the tire off and say they don't see or feel any damage to the wheel or the tire. They replaced the valve stem and dipped the tire in water to look for bubbles with no luck.
The tire kept losing pressure so I finally just installed a new tire on it. Well, 5 days later that tire is also nearly flat!
So I've eliminated the tire as the culprit and the valve is brand new. Could this be an issue with the wheel then? Seems like the only other logical choice. I've looked around and about $150-$160 shipped is the best price I've found for a used 19".
Can anyone suggest another possible way forward?
Fwiw, it's a slow leak and takes several days for the TPMS to alarm.