I am looking into buying my first diesel. I have really started to like what I have read about the 6.4's. I found one online that has 220,000 miles that has the EGR/DPF delete and a tuner. I was told that it runs like new and all miles are from driving hwy miles cross country n such. Also they said that all services were done by the owner every 5k is it worth taking a chance or keep looking for one with service records and lower miles? Thank you for your advice. Also I am finding a lot of 6.4's with out the mods for MPG how bad does that really affect the life of the motor?