Recommended by ADAC: https://www.adac.de/infotestrat/reparatur-pflege-und-wartung/motor-und-oel/motoroel/default.aspx?ComponentId=27479&SourcePageId=49407
H. Wei, Y. Wang, T. Wo, Y. Liu, and J. Xu. Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, page 2203--2208. New York, NY, USA, ACM, (2016)