DICTIONARY OF AUTOMOTIVE TERMS - "Oz"

Ozone:

A faintly blue form of oxygen produced by the silent discharge of electricity into the air. Ozone is very harmful to tires.

Ozone checking:

Cracks or hard spots usually found on the sidewalls of tires. Caused by the action of the ozone in the air on the rubber. This condition is normal, but could be dangerous on tires that are more than 65,000 km (40,000 miles) old or have been exposed to the ozone created by electrical machinery.

Ozone compound:

Rubber compounded with certain chemicals to retard ozone damage. Properly this should be called anti-ozone compound.

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