I had the china made valve stem problem
one day had a flat on my 2500 chevy, Michelin tires.
problem was the valve stem was rotten, they were all installed new when the tires were installed less than 4 years old.
got tire fixed and gently drove to tire shop and had the other 3 replaced.
had one go bad on my travel trailer, got trailer to my site, had to take tire off and it was the valve stem, rotten as could be.
so I took two tires at a time to local tire dealer and had new valve stems installed.
tire dealer told me china had got a bad lot of valve stem into the system, but most had been replaced by then.
that kind of stuff only happens to me.
so now I always option for the heavy duty higher pressure truck type valve stem, may not be any better, but it makes me feel better.