I've been running BD for about 50,000 miles. I always pass a 3/27 test, then water wash and keep soap below 100ppm. I had a weird occurrence a few months ago the FICM and all 8 injectors went all at once. I can't believe that event was fuel related though.
If you have a DPF prior to 2011, BD is not a good idea. The regen cycle will contaminate your engine oil with BD due to BD's higher vaporization temp. Many owners of DPF equipped diesels, using BD, had been seeing an increase of as much as 2 quarts in the crankcase between oil changes.For 2011 Ford reportedly changed to a 9th injector placed in the exhaust stream, thereby negating the contamination problems in the earlier models, caused by the regen cycle injecting fuel into the cylinders late in the exhaust cycle.