i am in the process of getting a bigger truck. i have been comparing the 2 and have found that i can get an 2001 diesel for about 2-3k more than an 2003 6.0. I have figured in the cost of ownership for the 2 vehicles: lower pmt, more $$$ on gas with the 6.0 vs higher pmt, better mileage with the 6.6. It comes out to be about $40.00 higher for the diesel per month. Here is my question: The diesel I am looking at is a 1 owner very nice maintained extended cab, black with 125,000 for $22,000 +++. Hopefully I can get it for 22 out the door. or a 2003 extended cab 6.0 with around 40-50K on it for around 19000 +++ roughly. I know most would say go for the diesel, but is 125k alot of miles? I know absolutely nothing about diesel repair, so are they a nightmare to repair if anything goes wrong? Any input would be greatly appreciated.