Hello and thanks for using Just Answer.I will try my best to help you with your question.
No, you are on the proper track.
But what has wondering is if the coolant has hydro locked the engine, you may have a head gasket problem which is also common with the 6.0L.
I would double check the estimate and make sure they were not also quoting the head gasket replacement because of the price of the estimate. $6000 is a lot for the EGR cooler and the oil cooler which is just below the intake manifold and EGR cooler.
Turn the engine over several times by hand only with the glow plugs still in place.
The coolant in the oil is caused by the oil cooler. Not sure why that would hydro lock the engine though.
Yes, they are correct there. But the estimate was really high for just an EGR cooler and the oil cooler.
Make sure you get the cooling system flush additive that you will have to put in the cooling system to flush out the remaining exhaust gases in the system or you will have the same problem again. Below are the TSBs that pertain to your problem and repair.
CLICK HERECLICK HERE
You can print them out. They are PDF files. They also list the parts and the part #'s you may need. Also the process for flushing the cooling system out.
Thank you so much for your help. I cannot open the links. could you resend? I will accept the answer upon receipt.
They are just PDF files. Make sure you can open PDF files. Also make sure you Adobe Reader installed on your computer.
Some of them are big. They may take a few minutes to download, based on the speed of your computer.