6.4 does not suffer from EGR issues or oil cooler issues and head bolts.

It will suffer from an EGR issue perhaps with alot of extended idling unless you do a high idle mod.

Be aware the 6.4 does have EGR and now also has the DPF (diesel particulate filter) to trap soot. that can or not be problematic. Depends upon your usage.

The dpf requires cleaning as part of the drive cycle. Could be anywhere from 50 miles to over 600 miles depending upon usage/load/fuel quality ect.

You have to drive it to clean it. It uses an injection of raw fuel sent down the exhaust into the dpf to super heat it and burn the trapped soot off. Then that soot turns to ash which is harmless to the enviroment.

So that makes for a clean tailpipe in the the 08 and diesels.

This sytem can be an issue if you are a city or low speed driver.

Another though here is commuting or short drives. This motor works best and will have fewer issues with longer operations then with shorter ones. Getting hot and staying there is better for this motor.

So...how do you plan to use this if purchased?