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This is caused by the oil cooler has either internally cracked or the large o'rings have failed causing a mix. Now why doesn't it mix the other way you might ask. Well coolant is compressed to approx 15 psi at any given point. Low side oil pressure is around 50-60psi. That is why it is alway oil in the coolant and not coolant in the oil. Now if you have fuel in your coolant fuel pressure is about 55-60psi and coolant is again about 15psi coolant surrounds the injector cups and if they crack well you get fuel in your coolant. Which one has failed?? That's a little more involved. Hope this helps.

Powerstroke57

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Q: Why is oil in your antifreeze in your 7.3 diesel?
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Correct antifreeze for 2006 dodge diesel truck?

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