Detrimental internal antifreeze leak. Please help!

Hi guys. I purchased a 2008 6.5l v8 military Humvee. Unfortunately the only test that I did not perform when I was purchasing was checking to see if there was coolant

This is where it gets complicated. I drove my Humvee for 30 miles. I didn't hear any clicking or knocking. Engine seem to be performing wonderfully. I noticed that my temperature gauge wasn't working

Let me start first saying that the oil was just changed by the guy I bought it from it looked very clean. I started to pour in antifreeze. When I got to the 4th gallon milky oil started pouring out of an oil pan gasket leak. And when I say pouring it was pouring. I had not yet even started the truck after pouring in antifreeze. If I didn't have an oil pan leak without a doubt my coolant system would have been full of milky oil as well. What are your best guesses?

You drove it 30 miles without any coolant?

NDT said:

You drove it 30 miles without any coolant?

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Yes it was only about 70 degrees. Didn't cause any issues worse that what ever is already happening

Eastern Surplus just got in a supply of GEP 6.5s, sounds like you need one. Yours is blowed up.

Yes
Blown head gasket cracked heads cracked blocked something internal went South

juanprado said:

Yes
Blown head gasket cracked heads cracked blocked something internal went South

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You think you could just be a head gasket or a cracked head? I'd rather pull it all apart and take a look at it before I go buy a new engine

Is there any kind of internal coolant housing like a internal thermostat or something in the oil pan that might have just came loose?

Nope. 6.5 block same cooling setup as a 350 Chevy.

You can take heads off and have them checked for cracks but the amount of fluid in your oil pan screams major failure.

I am afraid you will be waisting time and $ before determining you need a total replacement

I don't know the full story but someone who sold you a vehichle with fresh oil and no coolant plus a non working temp gauge shouts fraud and con job.
Ymmv

juanprado said:

You can take heads off and have them checked for cracks but the amount of fluid in your oil pan screams major failure.

I am afraid you will be waisting time and $ before determining you need a total replacement

I don't know the full story but someone who sold you a vehichle with fresh oil and no coolant plus a non working temp gauge shouts fraud and con job.
Ymmv

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This is what I was worried about