This article piqued my interest, and pH is traditionally only an aqueous solution, and a measurement of the "free hydrogen" (proton) content of an aqueous solution...so doing a pH test on oil made me alert.
http://www.machinerylubrication.com/Read/100/ph-test-tan-tbn
Note not just the article, talking about making use of the "TAN" solution, which is cosolving the oil with toluene, IPA, and water in specific ratios...can't get it to work without water, and can't dissolve the oil without co-solvents.
The article is interesting, but then the comments from a reader, and the response are amazing (IMO).
http://www.machinerylubrication.com/Read/100/ph-test-tan-tbn
Note not just the article, talking about making use of the "TAN" solution, which is cosolving the oil with toluene, IPA, and water in specific ratios...can't get it to work without water, and can't dissolve the oil without co-solvents.
The article is interesting, but then the comments from a reader, and the response are amazing (IMO).