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Takes 30 seconds Change the oil, start the engine, then shut down and check the dip stick and the oil will be black (there is enough old oil in the engine when you do an oil change to turn the new oil black pretty fast.
Of course it also depends on how big the engine is (amount of oil engine holds).
I have been running diesels for 50 some years. The only exception to this rule is my 1999 Ford pickup with a 7.3 diesel. That oil never turns black. I run Wolfs Head 15-40 synthetic blend. Change oil every 3-5000 miles.
Change the oil, start the engine, then shut down and check the dip stick and the oil will be black (there is enough old oil in the engine when you do an oil change to turn the new oil black pretty fast.
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