I'd suspect the laying up had more to do with it than the detergent factor in the oil. If it set for a long time, there's a good chance there was a lot of water from condensation in the pan.
Detergent oils get a bad name in cases like this because of the hype given to laundry detergents. Honest, they don't act like Scrubbin Bubbles. They do contain a surfactant, that will bond with surface crud and carry it to the filter. They do NOT break things up. A good surfactant in an oil will loosen stuff up well, floating it off the surface of any sludge, but gradually, so it is important, as you observe, to change oils and filters more frequently when changing over.
That said, there was a version of the later 5.9 Cummins in Dodge pickups that would "look" dirty after 500 miles, but would test as perfectly good, serviceable oil.
Depending on what you mean by the motor being "blown". . . if it truly is blown (i.e., rod or main bearings chewed up with the dmgage to the crank that goes with it, or broken rings . . .) a cleanup and oil change isn't going to help it. I
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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