What is in oil that gives it it's TBN?

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624
Location
Colorado, US
i would guess that the TBN is mostly related to the detergeny/antioxidant properties of the oil available and remaining. sulfer and magnesium being primary contributers. this is my *guess*. hehe.
 
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13,132
Location
By Detroit
My guess is a number of adds provide TBN, including calcium and zinc. Also, I though I read that an ester base oil provides a TBN effect although not measured in the TBN test, which might explain why Redline TBN is not as high as some would expect. OTOH, maybe I don't know what I am talking about (except calcium--a no brainer TBN constituent). Hey, I bet a search of the Question of the Day and/or Interesting Articles forums would answer the TBN question.
 
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47,817
Location
Everson WA - Pacific NW USA
Seems like you guys are on the right path, but you may want to search the "Question of the day" forum. Basic (and di/tribasic) compounds (yes Ca, Mg) as well as amines (alkanolamines, etc) all provide acid nuetralizing properties (taking H+), therefore in a lab test will give a (higher) TBN.... But there is more to keeping an oil in use longer than a relatively high TBN.
 
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