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

Not open for further replies.
Jul 1, 2004
Maple Valley wa.
I understand its TBN that allows oil to stay in use and neutralize acid longer but I dont know what it is that makes up the Total-Base-Number.
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.
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.
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.
Not open for further replies.