You may want to check the age of your tires while you are at it . It seams that a bunch of companies that have been selling tires as new have been selling tires that although never used are way past their expiration dates (yes tires have expiration dates)and the company you got your valve stems from has been caught selling some of them really old new tires too.
Tires are coded with a date of manufacture . Usually this date is stamped on the back side of the tire so you need to get under the car to see it. If the date on your tires is more than 6 years you should change them (even if you bought them as new as recently as a couple of months ago)
as tires age the adhesive that binds the threads deteriorates and can cause sever blow outs.
Stores have been caught selling these tires as old as 12 years recently and there has been very little info in the news about this.
Here is a link that shows you how to check the date your tires were manufactured.
http://20somethingfinance.com/how-old-are-your-tires-your-safety-may-depend-on-the-answer/
I now have four new tires that I bought at Sears before I knew that the valve stems where at fault. I told Sears today I want to be compensated for the four tires I bought because I just wanted to get back home safely and was scared that the other tires would fail on the interstate. So far, they’re only willing to pay for two, since, according to them, I could have outfitted the car with two brand new tires and left two four-year-old tires still on the car.
I’ve read that’s not a good idea to have mismatched tires. And why should I have to pay for anything? The defective valve stems were bought at Sears. They didn’t warn me that these stems were hazardous and should be checked and replaced immediately. I drove around on defective Chinese junk. I could have been killed. Others have been when their tires failed due to unsuspected leaking valve stems.
Check your rubber valve stems if you bought them between mid-2006 and mid-2008.