Generally when you have puking back through the Degas bottle it means that you have a clogged oil cooler. If you are using Ford Premium yellow silicate coolant junk or other silicate coolant, it is prone to cause the silicate to gel thus clogging the coolant pores of the oil cooler. With the inability of the proper amount of coolant to flow through the oil cooler (heat Exchanger) the oil becomes hotter than it should thus the oil cooler is hotter than it should be. Because it is hotter and the coolant flow is less, the amount of heat transferred to the coolant will cause it to flash boil and puke the superheated coolant back through the degas bottle and overpressurizing the 16 pound cap. That will produce the white stuff you see around the degas cap and bottle.
You can try to back flush the oil cooler using Restore to disolve the silicate gel. It may help but it may also completely clog the oil cooler further thus causing the needed replacement even sooner.
I just replaced mine myself as well as the EGR cooler.
2004 F250 Crew Cab King Ranch Lariat FX4 Saddle Leather 6.0 L FUMOTO Valve
AIRAID 4" straight No CAT No MUFF
Nitto Terra Grapplers All Terrain LT285/75R16 10 PR Everything else pretty much stock
NEW Ranchos installed 8/15/2010
WORK IN PROGRESS - R&R EGR COOLER, OIL COOLER, THERMOSTAT, TURBO BOLTS, GASKETS, ORINGS, and adding a COOLANT FILTER WITH NEW COOLANT AND FLUSH
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