I have a confession: I am a tire snob. With almost 60 years in the “car wars” as a master technician and vocational educator, there are three safety systems on any car I work on (especially my own) ...

If you've ever noticed green-capped stems on tires in a parking lot and wondered why the car's owner chose them, you're not alone. It's a popular question, and one many people answer incorrectly.

Have you ever noticed cars with mysterious green valve stem caps on their tires? If you have, you may wonder why some people choose to use them. Don't worry — a lot of people have the same question, ...