Some information may no longer be current. I bought a used car from a fellow worker who said he bought new tires recently and they were filled with nitrogen and that I should be careful to top them up with nitrogen, not air, when needed.
I don't have access to nitrogen and don't want to drive to a place that has it and pay the extra fee. What damage will air cause if mixed with the nitrogen? I am not a big fan of the use of nitrogen in tires. There are tire shops that will include free refills, which is also a sound move. However, rubber rot from moisture inside the tires of passenger vehicles is very unusual. Use this nitrogen dealer locator , but be aware that some filling stations require you to have purchased tires with them, or have a membership.
The tire valve stem will have a green plastic cap or a cap topped with a green indicator. The tire is purged of air and filled with nitrogen several times using a machine, which takes out most of the oxygen along with any water.
The Science of Putting Nitrogen in Tires Small amounts of air naturally leak out of tires over time, especially when tires are subject to large temperature swings.
Nitrogen is used to fill tires for track cars, since it does offer the advantage of more consistent pressure. How much will it cost to get nitrogen in my tires? Are they safe? There is no harm in topping off a nitrogen-filled tire with regular air. Also, some places that sell nitrogen tires do not sell nitrogen tire inflation services.
For example, Costco inflates all new tires with nitrogen. Will the mixture affect the tire pressure monitoring system? Well, there is no risk in mixing nitrogen and air in tires.
You can pump air in nitrogen tires and vice versa. Not really. The sensors only measure the pressure of the compressed gas. No matter what type of gas you use, there will be no difference in their performance. A tire loses pressure over time and changes in temperature accelerate this process. For every 10 degrees up or down in the temperature will cause the tire to lose 1 psi. Nitrogen is more stable and its rate of seeping through the tire walls is slower than the oxygen. It actually retains the pressure well but the difference is only 1.
The air has a portion of water in it. When the tire heats up, the water converts into a gas and increases the tire pressure. As the nitrogen is dry, there will be no pressure fluctuation.
However, the fluctuation between air and nitrogen is not significant. The same reason why nitrogen is thought to be effective in preventing wheel rot.
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