What can cause oil to mix with water and temperature to go up in an engine?

Answer:
blown head gasket,often accompanied by cracked or warped cylinder head....usually caused by letting engine overheat previous to finding this situation. can also be caused by frozen water in engine without antifreeze (in below freezing weather,of course) cracking the engine block.
First answer by ID1665889235. Last edit by ID1665889235. Question popularity: 2 [recommend question].