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Hello, common? no, symptoms for a failed headgasket? yes, oil goes through the gasket as well as coolant, bad rad, then cracked T Stat, may been caused by too much pressure in exhaust gasses, not that uncommon or from overheat,.I would not have a way to know, , Neither of us are looking and diagnosing so I am going to try and sum it all up for you
Book time for the engine>? about 8.8 hours, Book time for the head gasket? near 18 hours., It is more work to do the gasket than swap the engine then? you can run risks after all the repairs, and warranties are non exist or very minimal compared to an engine.I do not have advise but sure understand why they said engine vs headgasket, this is even how our shop would approach this type of repair. I am sorry to give the bad news side of this , I can only try to explain why engine vs headgasket, Gasket is risky at best ,