Compression Ignition Addict
Join Date: Apr 2007
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If there is oil in the degas reservoir, then the oil cooler has failed. This usually is due to the coolant "gelling" for some reason (or casting sand) plugging up the coolant side of the oil cooler - then it fails from excessive heat. This "plugging up" of the coolant flow in the oil cooler will then starve the EGR cooler for coolant and it can fail (the kate 04 and up EGR coolers are less reliable). If your EGR cooler fails, you lose coolant, can experience whie exhaust, will have coolant under the EGR valve, and can possible blow your head gaskets.
This issue is why Ford's newest flashes will initiate a code and a wrench light if the oil temp is more than 15 degrees higher than the coolant temp (at certain engine conditions). This is why gauges are a MUST to have. I have a DashDAQ and have helped several folks monitor used 6.0L's when they were test driving them. VERY adviseable IMO. That being said, I do not know the % of 6.0L engines that experience this problem, but it is enough to see MANY posts on the subject. I will say that SEVERAL Techs I know have stated that they have never seen an 03 (round) EGR cooler fail - only the later model square ones.
I love my 2006, but I installed a BulletProof EGR cooler just to be safe.
Also, the 05's and up are somewhat prone to leaks in the high pressure oil system. Replacement of the STC fitting, dummy plugs, and standpipes may be necessary eventually. Not a bank breaker by any means, but it is something to "weigh into" the price you pay.
Some folks say injectors are problematic, but run good fuel, use the proper oil AND fuel filters, keep the fuel pressure above 45 psig at all times, and the injectors are fine for 250k + miles (assuming the original owner didn't abuse things).
Keep batteries and alternators healthy, or you will be sending the FICM off for repair. Again, it isn't that expensive (around $250), but it is a somewhat common failure.
06 F250CC SB FX4 Lariat;ARP studs;OEM gaskets; Banks exhaust;DynaTrac Ball joints;Coolant filter; High-Idle;RACCCV6000;JimmiJammers;Ravelco;SynchroMax trans case;Fumoto valves;Harpooned;CPOhighwayProducts toolbox;tracrac;Fox Weatherboots;Wet Okole Seat Covers;BriteBox;Re-flashed;Quadzilla Recon XZT Fuel Press;Blue FPR spring;DashDAQ;PHP FICM;RiffRaff boots;DCPower270AXP;PowerInverter;Rancho7000's; BPD EGR cooler;One-piece HPOP fitting;BilletWaterPump;SCT w/ Matts SRL;ELC Ultra