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Reply to "What are acceptable TAN's"

Chris
Not sure who you talked to at Mobil but TAN is a routine analysis test for DTE 20 series oils in Hydraulic applications.

Bear in mind that fresh oil has a new value of approx 1.2 (due to additive response), an unsatisfactory level would be >2.7

As with all oil analysis, you would need to look at the trend of other parameters to decide whether an oil change was required or not.
Viscosity increase and oxidation levels would be the other critical parameters to monitor.
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