2001 hyundai 2.7 litre hyundai santa fe how did coolant get in oil

Friend borrowed vehicle and heater core hose leaked. overheated. DROVE it back, stopping to let it cool and adding water. The next day, checked coolant level
and oil level. Coolant most likely empty, oil level full. Changed out bad hose and replaced thermostat. Changed engine oil for good measure. Started vehicle and ran for a bit to make sure there were no leaks. Checked coolant level and it was low. Checked oil level and it was milky chocolate looking. What could have happened that caused coolant to leak in the oil after the repairs and there was no coolant in the oil i drained after overheating?
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Jim wrote:

Cracked block, cracked head, blown head gasket, warped head and / or block, or any combination of them.
Which ever it is it's likely time for a new engine.
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On 5/4/2016 1:18 PM, Jim wrote:

You have a serious problem. Overheated engines can get ruined fast by warping head, blowing gaskets or even cracking the block.
Time to assess the cost of junking versus the cost of a new/used/rebuilt engine.
Should be some good deals on new vehicles now so start with www.hyundiaiusa.com
I'm curious, were the hoses ever changed or were they original? Easy to just let them go, but the consequences can be expensive. After 5 years hoses can easily crack and leak so they should be replaced. Most of us don't though.
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