Engine cooling leaking in motor oil

Hello,

One of the common reasons for coolant leak into the oil is due to head gasket failure.
In order to get this fixed the cylinder head gasket needs to be replaced.
There are few different ways to check to see if the head gasket is blown.

Take a look at this video, it covers the typical symptoms and tests:

https://youtu.be/5zpNjYmmiYY

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.