Battle of Base Number Testing: D2896 vs. D4739

We have two ASTM Base Number analysis testing methods: D2896 and D4739. D2896 measures the Total Base and includes all sources of Base Number including detergent, dispersant, antiwear and antioxidant additives. On the other hand, D4739 measures the ‘hard base’ such as that from over-based detergents.

What’s the difference?

In addition to ASTM D2896, the Total Base Number of a lubricant can be tested by the procedure detailed in ASTM D4739. There are subtle, yet important differences to consider when looking at Total Base Number data from each. 

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Published November 21, 2017