Oxidative Stability test (ASTM D-6186)

The Oxidative Stability test (ASTM D-6186) measures the ability of a lubricant to resist oxidation at elevated temperatures. The test can be conducted on an oil or grease.

Typically reported in ‘minutes’ – The greater the time to exotherm, the better the oxidative stability of the lubricant. Test conditions are the the O2 stability method.

The test conditions:

  • 150°C or 175°C
  • 3500 kPa oxygen
  • 24 hours
  • 100ml/min oxygen
Red line: PAO 4. Blue line: PAO 4 with 1 additive. Black line: PAO 4 with 2 additives

Take a look at the article Understanding the role of antioxidants in lubricants

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