Yesterday I was in my favorite foriegn auto parts dealer and notice the Liquid Moly diesel clean cans.At $7 a can I went ahead and set up the service for the days wrenching.Ive noticed it requires a both fuel filters to changed after service but I do remember replacing my secondary filter a month before. At the end of the service I noticed the remaining liquid in the homemade small gas container ,gatorade jug, the fluid was discolored but not completely ,Im thinking along the lines that the videos Ive seen before were the demonstrators fluid is just completely black is due to just a wash down of the old filter giving them the idea that it was all coming from the fuel injectors. It did seem to start up better but other than road performance not a big change.Ill be doing new injectors soon ,pop pressure is were the injectors tend to be off alot of the time ,this is were I should see the biggest improvement in this old but still performing well 617 powerplant.Over 400k 1983 300cd