Compression Ignition Addict
Join Date: Sep 2009
Location: Atlanta area
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Change your fuel filters and oil if the dealer hasn't done-so. The 6.0 needs clean oil and doesn't much like extended drain intervals, especially with dino. Also, definetly flush the coolan THEN add a filter. Dirty coolant causes so many problems with these motors. There is a TSB on flushing a contaminated system using several gallons of Simple Green cleaner and 2 qt's of Motorcraft VC-9 iron block cleaner. Refill with distilled water and coolant of your choice, as long as it has the SCA's. Also flush your transmission for sure if it has never been done and replace the inline filter. Hope this has been done in the past 125k.
Keep that coolant clean and SCA's up to spec, keep the fuel filters clean and oil changed. Don't get on it hard until it warms up and maybe think about an EGR delete or upgraded EGR cooler. Do that and you should have most of the problems fixed up.
FWIW my truck is an '05 bone stock with all factory head bolts and EGR system and I havn't had a lick of trouble. I do keep the coolant clean and all fluids and filters clean too though.
If your truck has a stock tune I would put much money into gauges just yet, put the money into the things mentioned above first. The gauges are nice to have but you'll know if you're pushing your truck too hard with a stock tune, it's when you have a performance tune that bad things can happen without thinking they are.