David, I don't think you will find any engine that doesn't turn the oil black in 2,000-3,000 miles, even my brand new 2016 car with modern fuel injection did, I mean the first 2,000 miles out of the factory. Most definitely these engines, with such crude fuel delivery systems will blacken the oil in 2,000 miles. As it does on my truck with a brand new rebuild, it was scrupulously clean as well. Actually the subject was whether or not oil filters actually remove anything, which is where the matter of large diesel engines came up, simply because no one bothers to install a differential pressure gauge on their automobile, whereas large diesel engines commonly install them. Making it easy to see that the filters are genuinely removing something. (that was the point I was trying to make) However I don't know what would happen if you were to install one one a car. And as a real Delta P gauge is really expensive, (and I still don't know why they cost so much) I probably never will.
