Browse Publications Technical Papers 2001-01-3592
2001-09-24

Understanding Oil Aging in Extended Drain Axle & Transmission Applications 2001-01-3592

Extended drain of axle and transmission lubricants has gained wide acceptance in both passenger car and commercial vehicle applications.
Understanding how the lubricant changes during extended drain operations is crucial in determining appropriate lubricants and drain intervals for these applications. A suitable aging screen test with an established relationship to field performance is essential. Over the years numerous methods have been studied (DKA, GFC, ISOT, ASTM L-60) with varying degrees of success1,2,3. Current methods tend to be overly severe in comparison to field experience, hence the need for further work in this area.
As a result of recent work, a lubricant aging test method has been developed which shows good correlation with field experience, giving us an effective tool in the development of long drain oils.

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