I AGREE 100%
Originally Posted by cammedzx9
that is a cracked head where the fuel passes through the cylinder head, it will need a new cylinder head, if the diesel was in the oil it would be a injector
In order for diesel fuel to contaminate the cooling system on a 6.0L, fuel would have to leak past not only the injector sleeve, but also the lower o-ring on top of that too, before it even makes it to the sleeve in the first place. That said, the likelihood for failure of both those components are slim to none, making the probability of an internal crack inside the cylinder head(s) to be quite high.