Originally Posted by peterf.
hi ok so a budy of mine is looking to purchase a 2008 and up 6.4 i dont know much about the 6.4 as i have a 2006 6.0. are there any issues with the 6.4 like the 6.0 have? im going with him in a few days to look at a couple trucks is there anything to pay special attention to? thank you in advance for any help
Be sure to look at the rear main seal area for evidence of oil. You can also tell if it's been wiped off recently. It could be something simple to fix or something well out of the scope of your ability to fix and really expensive (unless you are a diesel tech).
Check for receipts of maintenance. Find out if it's been tuned, if not, check the tail pipe for soot (evidence of tuning). Drive it with no shifting or tranny issues, no wheel slop or play. Actually drive it for as long as you can, offer to put some fuel in it, and then drive it back.
I can't think of anything else glaring that wouldn't already present itself while driving.
Hope this helps,