2014DIN 51639-1:2014 Testing of lubricants - Test methods - Part 1: Determination of total base number
1985DIN ISO 3771:1985 Petroleum products; total base number; perchloric acid potentiometric titration method
0000 DIN ISO 3771:1983
DIN ISO 3771:1985 Petroleum products; total base number; perchloric acid potentiometric titration method was changed to DIN 51639-1:2014 Testing of lubricants - Test methods - Part 1: Determination of total base number.