Though the following paper is not information dense, it does attempt to probe the relationship between detergents and an FM. I found it curios that MoDTC supplemented formulations changed their apparent coefficient of friction over time. Additionally I found it interesting that in the face of lower apparent friction, wear was not appreciably affected.
http://www.imeche.org.uk/tribology/pdf/Green.pdf
http://www.imeche.org.uk/tribology/pdf/Green.pdf