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No. of Recommendations: 5
Air is about 79% Nitrogen. It's a scam.

Actually it's about 78% nitrogen, 21% oxygen, and small amounts of other gasses like argon and carbon dioxide. However, the 21% oxygen does cause oxidation of the rubber on the inside of the tires, which can make the tires brittle, and more likely to blow out. Keeping tires filled with nitrogen will prevent the oxidation on the interior of the tires. And I do find that my nitrogen filled tires are less likely to set off my TPMS when the weather turns cold. I used to get TPMS alerts 3 or 4 times during every fall when I had tires that used air - now, with the nitrogen filled tires, it's usually only once. That said, if I needed to fill a tire and the only option was filling with air, I would use air rather than waiting to fill with nitrogen. The guys at Costco (where I bought the latest tires, and they only use nitrogen) said that I would just need to let them know the next time I came in for service.

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