Many drivers wonder if they can replace nitrogen with regular air in their tires. While looking for a way to keep tires inflated longer, especially in changing temperatures, some consider inflating ...

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, ...

Green caps on tire valve stems usually mean the tires are filled with nitrogen instead of ordinary air. Car dealers, tire dealers, repair shops and even some gas stations have touted nitrogen for ...