"Oil and coolant mix when you have a blown head gasket"
More often than not you DONT get mixing. Not sure how that myth started but Ive personally delt with 5 BHG and none of them mixed. All of them have been a failure between a coolant passage and the combustion chamber.
Petridish's explanation is right on
Blown headgasket? Cracked block? waterpump? - LONG
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