I have researched that the head gasket needs to be replaced due to me putting concentrated antifreeze in the tank instead of diluting it with water 50-50, making it into coolant research I’ve done has said I need to replace the head gasket. Is this true or does anybody have any other suggestions or advice? What could’ve caused this where and would start off I would drive and all of a sudden at a red light it just stopped. Engine went dead. I’d have to tow it back. It’s the only thing that’s changed. Is me buying concentrated antifreeze I did not dilute it 50-50 and until I looked it up didn’t know the definition of coolant and antifreeze were different. Other than that. It was a fully healthy engine with 44,000 miles both batteries the house and the star engine were relatively brand new and replaced and it’s used 1994 Thor industry Mystic RV that I recently bought used for the low miles replace both batteries other than that I don’t know why I won’t start now since I told her back the last time