1. Jones, M.H., Scott, D. E., 1983. Industrial Tribology: the practical aspects of friction, lubrication, and wear. New York, Elsevier Scientific Publishing Company.
2. ASTM Viscosity Index Calculated From Kinematic Viscosity, 1965. ASTM Data Series DS 39a, American Society for Testing and Materials, 1916 Race Street, Philadelphia.
3. Mobil Lubricants, 2012. “Mobil Delvac MX”. Website address: http://www.mobil.com/USA- English/Lubes/PDS/NAUSENCVLMOMobil_Delvac_MX_15W-40.aspx., Last accessed: 13/12/2012.
4. Saurabh K., Mukherjee, P.S., 2005. Additives Depletion and Engine Oil Condition – A Case Study. Industrial Lubrication and Tribology 57, p. 69-72.
5. Stachowiak, G.W., Batchelor, A.W., 2005. Engineering Tribology. Burlington, Elsevier Butterworth-Heinemann.