Thanks satterfi,
From that I gather that MoTDC is what is used in motor oils including RP. The reason for the question was this quote, by Terry from Dyson Analysis,from this thread...
http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=000010#000005
"Kalbri,Street RP is what...