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Originally Posted by SodaGuy
TBN is only one factor used to determine oil life. FTIR testing which shows oxidation/nitration levels is also important; or Insolubles/Flashpoint if the lab that you're using does not offering FTIR testing.
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Yeah... I got 3 of those lol (the FTIR).... No really I do in my lab, I don't use them for oil analysis though.