I've got a similar story with a 2000 Ford Excursion I bought. Engine was loaded with sludge, so I just installed a MotorGuard M100, changed the full flow and added 2 quarts. I never dumped the oil, just ran it.

Every 300-500 miles the filter was plugged, kept changing it and adding a quart. After 10,000 miles engine was clean and filters were making it to 3000 miles. From then on changed filter every 3000 miles. 31,000 miles with no oil changes and oil continued to pass. I still have the truck but is only used as a spare vehicle if needed.
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