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I still have the same factory installed valve stems and tires today that came with the rig back in 2003 and have never had a leaking stem.
I sometimes question these "leaking stems". Did the dealer actually detect a leaking stem or were they replaced as a last resort. What I am getting at is quite often the "valve core" goes bad or just needs tightening. A lot cheaper tightening or replacing a valve core than dismounting, dismantling and remounting a tire to replace a valve stem unnecessarily. Only time we replaced valve stems is when the old ones were cracking or when installing new tires.
In my many years in the tire service business I could have made quite a bit of extra spending cash replacing perfectly good valve stems rather than tightening a leaky valve core. We charged for new valve stems but we tightened valve cores as a no cost courtesy.
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