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Discussion Starter #1
Hey guys hope I can get some help here.
.I have an 05 f350 that just hit 60000...did sinister delete kit and oil cooler with sct tuner at 57000 miles...just drove 1300 miles and when I got home and checked oil and coolant...next morning I noticed oil level was up on dip stick and mixed with what I assume is coolant... same with Degas bottle seems oils mixed on it and is almost like chocolate milk ....so here's my problem...? No power loss..no white smoke ..no whistle or residue on Degas bottle...I have parked it since and am just trying to figure best thing to do??
 

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oil cooler is shot. You need a new oil cooler repair, in this order Did your EGR cooler fail? The way this works a lot of the time is the oil cooler plugs up and then takes out the EGR cooler. Over time a bad oil cooler will pop. You can go OEM or spen the cash for a Bullet Proof Diesel cooler.

1. Flush cooling system with super clean or simple green.

2. flush cooling system with restore

3. Replace every rubber hose in the cooling system now or one by one over the next year.

4. Replace oil cooler

5. Install coolant filter

7. Test for bad head gaskets. See below for a quote of a diffrent post.


Q: Do I have a blown head gasket?

A: Generally if there is a slow gradual pressure increases in the cooling system over 16 PSI then this points to an EGR cooler / oil cooler failure. If the pressure in the cooling system tries to head to and exceed 20psi pretty fast in a cool motor then this points to a head gasket failure. Put a Tee in one of the rubber lines going to the de-gas tank and attach the line for your gauge to that. Or buy new hose and make a test rig to use for now and then loan to all your buds later on. This is as simple as a 3/8 hose barb Tee,5 clamps, 30 PSI gauge and some 3/8 air line. Cut 2 short stubs out of the air line to span the gap between the manifold and the de-gas tank. Next since you saved the end of the air line that has a 1/4 FNPT fitting crimped to it, the free end goes to the tee and your gauge attaches to the factory crimped on FNPT fitting. You will use a gauge with a 30 full scale reading. The cap on the De-gas tank is a 16 lb relief, this is why 16 psi is the magic number. The pressure you reach is not as important as the rate of climb. The reason for the slow increase in pressure for the EGR cooler/ oil cooler failure is as follows. The oil cooler plugs up and starves the EGR cooler for coolant thus turning it into a superheated steam generator. This point source of heat and excess pressure will lead to the EGR cooler failure. In this condition some have reported the melting nipple on the de-gas tank the attaches to a rubber hose that vents steam from the EGR cooler.

The rapid rise in pressure associated with a head gasket failure is caused by combustion gasses entering the cooling system and raising the cooling system pressure until the vent on the de-gas tank cap opens and the puking starts. I think NAPA has a test strip you can use to detect combustion gasses in the coolant.

OK so with a quick check of a saturated steam chart this is what we know.

15.3 PSIg steam equals 250 degF

20 PSIg steam equals 259 degF

What this mean is that if you take a cold truck out and run the heck out of it and it builds pressure to 20PSI or more and the coolant isn’t 260 deg then it’s a safe bet that combustion gasses are entering the cooling system because you have a bad head gasket.

Water boils at 212 deg at zero PSIg. In a closed system there is a very predictable relationship between steam pressure and steam temperature. This is why cooling systems are pressurised. This way you can have 248 deg coolant that is at about 15 PSIa and you make no steam because the coolant isn’t it’s boiling temp for that pressure, it is however saturated. Now at addition of ethylene glycol raised the boiling point too but for what we are taking about we can use a table for water-based steam. If the system doesn’t get hot enough to the point it should make steam and its building pressure you know that pressure is from a different source like combustion gasses entering the cooling system. From ---- wait for it ------ BAD HEAD GASKETS.
Good luck and see my t-shooting guide post in my sig.
 

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Discussion Starter #3
thank you for your time very helpfull... and yes happened in this order...i replaced egr cooler twice before and then went to a different mechanic and we instaslled a sinister egr delete kit and flushed system new lines and hoses and truck has ran great ...drove it 1300 miles with a small trailer and i checked my fluid levels frequently during trip and no changes or problems.. when i got home and checked fluid next morning i had oil rise on dipstick and looks like oil mixed with coolant in degas bottle..chocolate milk look...i do have the sct tuner that comes with egr delete kit and have to clear the temp code frequently but was told by sinister that its common to have to clear that code because computer still thinkis egr is there and coolant to oil temps have changed over 15 degrees?
 

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Sinister told you that?
There would be NO temperature changes in the coolant or the oil due to an EGR delete. Zero, zip, nada. Not even a 1/2 a degree.
ADD GAUGES to your truck, watch them religiously and pay attention to what they are telling you.
Check out the link in my signature line (basic info) for some info you need to know.
 
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