I purchased a F350 6.0 powerstroke 2006 Lariat with 150k mi. Absolutely love my truck. Since owning her I've done an EGR delete . Recently towed my 26' 5th wheel from Vegas to Kansas, approx. 1020 mi. I have a SCT tuner set to street using tow haul while pulling rv. which is another question altogether... I am so paranoid of my truck breaking, overheating that I had my wife do most of the driving to Kansas, Ok all of the driving...Temp ranged around 220 coolant 240 oil...After a thermostat replacement before we hit the incline of the Rockies temps returned to 200 / 210. we would stop pre thermostat every 20 min to allow her to cool down. I plan on keeping her forever..Of course my wife also. I wasn't knowledgable enough when starting the preventive maintenance to replace the oil cooler while doing the delete..I want to have more piece of mind when my wife drives to the next town 27 mi. away. that my truck wont fail...what is the cost of head studs Bulletproofing..Or replacing oil cooler??