Diesel Emission Modification Extended Warrenty Poll

OK, so my 2012 E350 Bluetec qualifies for the Complimentary Emission Modification and I can get either a 4 year/48,000 mile Extended Warranty and $2000.or a 10 year 120,000 mile Warranty. The 10 year Warranty sounds like the way to go, under normal circumstances... But I am hearing that there are problems with the modification including engine issues so I wonder if this car will still be running in 10 years. I have 100K on the engine and the car is in great shape in all regards. Yeah $2000 sounds nice but any engine problem will run a lot more than $2000, a whole lot more... I had planned on keeping the car for at least another 200K.

I would like to hear from you guys/gals that have had the modification. What is the consensus regarding the 4year VS 10 year warranty?

I appreciate your response.