Hi,
My first suspect is the oil cooler/oil adapter. (See pic 1 below) This is where the engine oil filter is installed. Note that the degas bottle and lower radiator hose connect to it. Coolant runs through it to help cool the engine oil. It sounds like it has failed internally and is allowing coolant to go into the engine.
If you follow the directions in pic 2, they explain how it is removed. This is where I would start to see if there is damage to the adapter or if there is a failed gasket.
Let me know what you find or if you have other questions.
Take care,
Joe
See pics below.
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Monday, February 20th, 2023 AT 8:18 PM