3 reasons Oxygen is bad for your tires.
Although you can’t see it, inside your tires Oxygen and moisture eat away at the inner rubber layers and steel belts.
Tiny Oxygen molecules leak through your tire’s inner rubber layers much faster than larger Nitrogen molecules.
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While you drive Oxygen in your tires heats up and expands.  Then it cools down and contracts while your car is parked.  This results in continuous fluctuating tire pressure.