Diesels blacken their oil promptly. Even I know that (very few diesel cars in No. America).
As coincidences would have it I saw an early '80's Benz put forth a huge black cloud as it clattered it's way onto the state highway this morning.
Gotta agree with the advice of avoiding "chemical flushes" or solvents in an engine especially diesels with their higher compression ratios.
"Everyone" says to run a working engine with more frequent oil changes to dissolve unknown accumulations of crud. Because good oils are so dear, it's tempting to "throw a grenade" into the pan.
"Add a quart of kerosene and let the engine idle for 10 minutes before draining" is scripture for some.
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