Here's a link that discusses it. Not a glowing review.
http://theoildrop.server101.com/forums/showflat.php?Cat=0&Board=UBB5&Number=304897&Searchpage=1&Main=304884&Words=Risoline&topic=&Search=true#Post304897

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend