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I saw this info on the Maxx Force 7 engine (Same basis as th 6.4 in the 2008 Super Duties). Right at the bottom of the page, there is a B10/B50 Life rating in miles. Are they talking about different Biodiesel mixes, or some industrial duty-cycle I haven't heard about?
Currently International Maxx Force engines are B5 max. But there is some limited information on B20 being acceptable in the future. Page 18 of this linked document on the 2007 International Emissions.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.