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Overtime: includes pay received for the number of hours worked in excess of the standard workday or workweek.

Owner's manual: Every new vehicle is supplied with an owner's manual which gives the basic instructions for operating the controls. It includes a maintenance schedule and specifications such as the type and quantity of fluids. For instruction on repair work, you will need a service manual which may be ordered from the dealership which sold you your vehicle.

Oxide: See aluminum oxide, nitrogen oxides, and nitrous oxide.

Oxidize: Action where surface of metal is combined with oxygen in the air to produce rust, scale, etc.

Oxidation: One of the processes by which enamel paint cures, by combining oxygen in the air with the paint film. This process dries and continues to harden enamel for several weeks. Oxidation also results in chalking in older paint.

Oxygenated gasoline: Any fuel with a mixture of ethyl or methyl alcohol. The addition of oxygen causes a slightly leaner fuel-air mixture which is especially beneficial with older cars.

Oxygenated gasolines: See oxygenated gasoline.

Oxygen sensor: A pollution control device which measures the amount of oxygen in the exhaust. It controls the fuel-air mixture entering the engine.

Ozone: A faintly blue form of oxygen produced by the silent discharge of electricity into the air.

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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