I have heard a few rumors and I would like to know if there is any truth to them.
I have a 6.0L psd and have run B99 for the last 2 yrs with brief breaks for winter (FL) without any problems from the biodiesel.

1. I have heard that it can be hard on the 6.0L diesel injectors. I have been caught a few times with a gelled tank (unexpected cold morning with B99). I now keep a jar of b99 next to the truck. The truck definitely does not run as smooth or seem to have as much power until warm with B99 compared to dinodiesel or even b50. Once the engine is warm there is no difference. This is true even at 90+F outside.

2. I have heard B99 can dissolve the glue that holds the motorcraft oil filter together. I have done several oil changes (every 5000mi) in the last 2 yrs and I have not noticed any problems with either oil or fuel filter breakdown.

Disclosures: I buy retail b99 that is usually palm oil derived (it gels at 60F). I have a Banks Big Hoss set-up with the PDA tuner set on 6.