Couldn't agree more, Bugman.The black in the diesel oil is soot from the cylinder walls that gets washed off and into the oil. It is the filters job to get rid of it.
Hotshot would have nothing to do with cleaning the oil. Even their web site says nothing about cleaning the oil.
You can't replace wear with chemistry. It's injector solenoid wear that causes the stiction in electronic engines.The stiction eliminator will help clean the engine.
The diesel extreme works, but only supposed to run it once every 6 months.
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