Modern engines can easily go more than 100,000 miles without issue. In the early days, once a vehicle got near 100,000 miles, it was 'worthless' and no one wanted it. Machining, lubrication, metallurgy, has made that a thing of the past. Diesels turn at a slower RPM, and are built to handle the higher pressures needed to ignite the fuel, so they can last many miles past the 100,000 mile mark.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI