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Originally Posted by johnnyddn
Bad piston rings maybe? While the car is idling, try taking off the oil cap and see if any smoke comes out.
Also I was wondering how long did it take you to replace your HG? I was thinking about doing it but didn't know how much of a pain in the ass it is to do. Is the 2mm the size to go with if you haven't had any other previous HG problems with the car?
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Bad piston rings won't allow coolant to mix with oil. There are only 2 problems I can think of that cause oil and coolant to mix, Bad head gasket or cracked head.