Head gasket or oil cooler?

Parvel

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Hi guys, my TT with BAM engine temperature light came on with temp well over 100, pulled over and switch the engine off but coolant was coming off from the back of expansion tank as a brown, foamy sludge.
Sure thing my oil has mixed with coolant but where? Has head gasket blown or oil cooler has a huge leak?
There was a quite big pressure in expansion tank pushing almost all foamy sludge out on the floor, also, almost all oil has gone.

What option is more probable? I'm concern of the pressure in the tank and foam like consistency of the mixture.

Cheers