You DO NOT want to burn used oil in your diesel.....you will ruin your fuel injection pump, clog filter, clog injectors, and soon things will come to a grinding halt! Don't think of diesel fuel injection system as an oil burner in furnace that burns No. 6 (dirty, tarry) fuel oil. Two different things.....your injection pump on the diesel car is one of the most sophisticated achievements of engineering delivering precisely measured quantities of fuel to several injectors at the precise moment fuel is needed at each cylinder, and injectors must blow fuel into chambers in very fine atomized form..etc. etc.. Put in used oil with dirt, minerals, metals, carbon, etc., even if filtered, you will ruin the injection pump and the injectors.

Used oil can be burned in an oil furnace designed to burn No. 6 oil, as the two materials are very similar in nature...in fact, the used diesel oil is probably cleaner than No. 6 oil.

A a totally unrelated aside, when I was a kid, I lived on a dirt road, and every summer, city trucks would come by and spray black oil...must have been used crank case oil on the road to keep the dust down...of course this is where us kids played as well!!! The oil probably also contained waste PCB oils and other nasty stuff!!!

good luck,

mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)