To answer your question about the viablity of using WMO when properly filtered in a 6.2, it is an Indirect Injection Diesel, and it will run on a substantial percentage of WMO/ATF.
I built a setup this fall for me and a roommate w/ a 12V cummins to experiment w/ WMO. His dodge will run normally on around 50% WMO. above that it smokes on idle.
Right now i am driving on 85% WMO filtered to 2Microns using 3 particulate water filters and a water seperating diesel fuel filter. 30 microns-20 micron fuel/waterseperator-10 micron-5 or 2 micron final filter.
We have about 180 bucks into our entire setup, consisting of several 55 gallon drums, an air compressor, an inline air pressure regulator, and several 2" bungs that have been drilled and tapped to accept 3/4" NPT pipe fittings, threaded into PVC tubing that extends from down into the tan to our filters then through regular garden hose and into fuel oil storage drums.
we run about 15PSI in the oil drums to push a good flow through the filters, and about 5PSI to push the fuel oil from those drums to our gas tanks.
So far no problems to report, it has been about a month and i have run 200+ gallons through so far. The engine runs MUCH quieter, starts fine, doesnt smoke more than usual, etc. EGT's are about 40 degrees warmer on average due to the higher energy density of WMO vs Diesel.
We currently are about to begin experimenting with ATF to a greater extent, as we just found a source locally.
Will keep you guys informed.
P.S. w/ diesel at 2.64 a gallon w/ 85% WMO, it costs $.02 per mile to drive....