I have a 08 6.4 that I'm in the process of trouble shooting and replacing parts.... What happened when the old girl broke, one of my friends called for me to pull him out of the mud. I tried pulling him 3 times my EGTs never got over 700 my coolant temp was 200 with my oil temp the same when I got him out of the mud I was letting my truck cool down at idle. As I was at the rear of my truck it started poring out black smoke and idling ruff as I went to turn it off it started to knock turned the truck off hasn't been able to turn over sense it will crank won't start I towed it to the shop where I started doing test no codes on the tuner nor on my scan tool nor any wrench light Iv done compression test on all cylinders none went over 250 psi which is low no fuse blown or anything no coolant loss or mixed with oil but my oil does have a smell not like fuel or burnt need help it's a good truck only 100 thousand on it