Does anyone have clear oil after 5k of diesel time? I'm just curious if you flushed and cleaned your engine really well, and then kept your oil changes up if one would be able to clean out the oil systems and keep clean oil for 5k or more. Any opinions, or will it always be black as ink by merit of being diesel?

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1990 300D 2.5 Turbo 150k miles
1999 F250 7.3L Powerstroke 225k miles 22mpg
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