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OZ maintains a stringent policy of Total Quality

The pursuit of producing wheels of the highest quality, and providing unsurpassed customer satisfaction, remains at the centre of the OZ manufacturing philosophy.

OZ's Quality Control tests:

Chemical analysis on raw materials and castings
Ultrasonic Inspection to reveal defects and impurities
Air Tightness to identify any air leaks caused by porosity (wheel submerged in a tub of water, air enjected under 5-7 atm)
Dye Penetrant Inspection to identify any superficial cracks or microfaults (chromatic contrast under UV light)
Fatigue test wheel subjected to the same mechanical stress of a car driving along a bend
LBF Biaxial Wheel Testing Machine
Rolling test simulates the behaviour and reactions of the wheel along a straight stretch(maximum load, 100 km/h)
Impact test (crash test) simulation of stresses that the wheel might suffer on the road
Dimensional check to assess the dimensions, circularity and concentricity of the wheel (tolerances of a few tenths of mm)
X-ray control