Just a reminder - If your caps seize try heating them with a lighter or a torch ( we have a small SnapOn torch for use in tight spaces). I was told my daughter's car would need 4 new stems and sensors. We got the other three off by heating them a bit, no problems. The dealer broke the 4th one. If you are taking your car in for service I'd suggest checking the valve caps before you drop the car off. All you need is a inexperienced tech to get a little heavy handed. By the way, my stock wheels came with metal caps, so did my daughter's Audi.