The resistance of lubricants to chemical reactions with oxygen. The absorption and reaction of oxygen may lead to degradation of lubricants. Several test methods are in use, including ASTM D942 (IP 142) and D5483. Elevated temperature bearing test methods such as the Ball Bearing Grease Life Test (ASTM D3336), the Wheel Bearing Grease Life Test (ASTM D3527) and the FE9 (DIN 51281) are also used.
