* Increased viscosity: B100 is thicker than regular diesel, potentially leading to poor fuel flow, clogged filters, and damage to the high-pressure fuel pump. The fuel injectors in particular are vulnerable.
* Fuel degradation: Biodiesel is susceptible to oxidation and degradation, leading to gumming, varnish deposits, and injector fouling. This is exacerbated by the age of the vehicle.
* Sealing issues: B100 can damage or swell certain seals and gaskets within the fuel system that are not compatible with its chemical properties.
* Lack of warranty coverage: Running B100 will almost certainly void any remaining warranty on the fuel system.
* Cold weather issues: B100 gels at much higher temperatures than regular diesel, making it unusable in colder climates.
While some individuals *claim* to have run B100 successfully, they often do so with modifications or at their own considerable risk. These modifications often involve upgraded fuel filters, different fuel lines, and even aftermarket fuel system components designed for biodiesel. Even with these modifications, it's not a guaranteed solution and long-term reliability remains questionable.
In short: It's strongly recommended to stick to the recommended fuel specifications for your 2011 Ford 6.7 Power Stroke. Using B20 (20% biodiesel blend) is generally considered acceptable, but always check your owner's manual for the manufacturer's recommendations. Running B100 is highly discouraged unless you are prepared for potential significant repairs and understand the risks involved.
