Who has the Highest Mileage Slant-6??

Not a slant, but a 95 Dodge Ram 3500 passed a million...Chryco gave him a book, big whoop...
http://www.autoblog.com/2006/04/03/chrysler-ceo-calls-owner-of-million-mile-dodge-ram/

An almost 50 year old P1800 Volvo is approaching 3 million...

Moms Duster L6 had ~225,000 when she sold it.