Diesel is it a head gasket or is it a EGR cooler 🤔🤔🤔 link to Mario video is in description

Making the right decision is what we try to do and this great video i was talking about and learned from is from Super Mario Diagnostics      Video  Helped Me use some new school ideas to make the right fix first time ,hopefully help people not make a mistake that could of happened here
I’m no Harrison ford but I try 😂😂😂😂😂😂