I was so excited to here that an Isuzu dealer actually knew how to properly deal with VX issues, I wasn't totally clear on how this happens, left out a detail.
The egr restriction causes the computer to slightly richen up the the fuel mixture. This washs out the rings and the oil becomes slightly deluted with fuel. This also contributes to pcv restriction within the lines. Denver Isuzu charges $208 to run a special chemical cleaner through the system to clear the tube and all the lines. The gas in the oil slowly damages the bearings. Since the computer made the adjustment, you may only see an intermitant check engine light in response.