Yes it is a great motor IF taken care of... there are some bugs so expect a bit of work but what vehicle is perfect
non that I know of!!!
Yes you want to make sure the coolnt and oil temp are not more than 15* apart when driving empty down a flat highway going 60-65 mph.
If they are then you need an oil cooler.
The biggest problem with these engines is the oil cooler which gets clogged and does not allow sufficent coolant flow to the EGR Cooler... then the EGR ruptures and sends coolant into the cylinders...thus creating the dreaded Head Gasket problem...
It all starts from a clogged oil cooler and if you check those temps should be able to see the health of the motor.
If you are looking for a 6oh for sure.. then you NEED a monitoring solution like a scangauge2 or an edge product like the CS or CTS..
they will help you out in your quest for a GOOD truck...you need to see the parameters before buying
coolant and oil temps, FICM volts, Battery volts.
Also make sure to check around the coolant overflow bottle by the cap to check for puking coolant... it is commonly seen as white flakes/ fried coolant around the cap...
That means bad cap, bad egr cooler, or Bad Head Gaskets... i assume you wont want to be the one to figure out which onw of those it is AFTER you buy a truck