I'm getting real close to buying an 2008/2009 6.4 and after about 6 months of research my question is. You're absolute must/1st mod you would do would be? DPF/EGR delete tune? ORRRRR AirDog fuel/water seperator??? Just from my research it sounds like the most sensitive/problematic things on these are contaminated fuel and then fuel in oil due to the DPF regen cycle, then either or both of those leading to very expensive repairs. I've looked at the cost of replacing the k16 and injectors that looks like it sucks, but then also replacing/rebuilding I guess is the flip side if I run awhile with fuel in the oil. I'm a maintenance nerd (grew up on a farm and we keep equipment...still running 1066's, 1086, 4850 JD, 8630 JD etc so G-pa and dad kicked my *** if I didn't check the fluids daily) so if I watch and make sure I'm not "making" oil, wouldn't the likely first mod be the AirDog just in case the fuel had contaminants from prior ownership?
Also, how do you all feel about a 6.4 with 150,000?? If they last that long surely they've been maintained properly...if not they typically have failure before then??
lay it on me guys, looking for any and all feedback.
One last thing, I live near Upper Sandusky, OH and have had great service on my Tahoe at Ralls Automotive, and I know they work on diesels and would probably have them do all the work on my 6.4 anyone have experience with them? They have two sharp 6.4's up there with "Ralls Diesel" stickers in the windows.
former 6.0 owner that didn't have a lick of trouble! except diesel going to $5.00/gal in 2007