I remember reading this story, I do not think he recommended 100,000 mile oil changes, he told of how he was able to run a 100,000 oil change with a Lincoln (or some large Ford with a huge engine), he worked for an engineering department for the Ford Motor Company.
The 100,000 mile oil change interval was done with 1 quart of oil added every 5,000 miles to top up (oil burn off), also, I believe he replaced the oil filter every so often.
If my memory serves me the oil's condition was monitored during the 100,000 mile interval.
This gentleman also mentioned his department received some (synthetic) oil from a lube manufacturer free, and this synthetic ran more then three cycles and maintained its lubricity while most petroleum lubes would turn to goo or molasses during the second cycle.
This article showed burn off percentages and many other comparisons for many of the oils synthetic & petroleum sold during the seventies.
Bill