Also a great point — one sees on the road at times whe you know the guy ahead has troublesAsk the shop specifically for a block check. They can do it before tearing it down and you spending any more money. It uses a blue liquid that will turn yellow when combustion gases are present in the cooling system and will detect even the smallest combustion leaks.
A blown head gasket or cracked head won’t always put oil in the coolant or coolant in the oil. The coolant maybe going out the tailpipe.