Fortunately, Ford at least, has addressed this in their new 6.7 powerstroke engine for 2011. And I do believe the others will (or already have) as well. My understanding is that the regen cycle will utilize a "dedicated" injector in the exhaust so that the fuel-oil dilution problem goes away. 
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Bruce
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96 F250 PSD, CC, SB, 2wd, auto, 285,000 miles, Tymar intake, 10K mod, FPR shim, DIY Exhaust Brake, 3" downpipe, rest is stock, B100 all the way!
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