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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* 96 F250 PSD, CC, SB, 2wd, auto, 3:55s
* 280,000 miles
* Tymar Performance intake
* 10K mod
* FPR shim
* DIY Exhaust Brake
* 3" downpipe
* Rotella Synthetic Engine Oil
* B100 all the way! 
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