Had similar results in a 80 series cruiser with 1HDT at 450,000km , new filter & oil would stay clean for a good 5000km , before that it was the usual black after a 5 min drive subsequent to a filter and oil change.
The engine finally blew up at 540,000 km but still running clean.
Interestingly my (new in 2013) Iveco Daily 4x4 oil went black after 50km , and being new wasn't about needing flushing. I removed and blanked off the EGR at about 30,000km and now the oil stays a nice honey brown till 10,000 km . ( I change oil at 15k , not the recommended 40k) .
Just saying if you have an EGR still operational don't expect the oil to stay clean.



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