Subaru Head Gasket Failures Explained

I have seen more than my fair share of head gasket diagnosis from repairing Subarus. I’ve done so many, I can pretty much do it in my sleep and without pulling the motor from car. Diagnosing a head gasket issue is easy, but some may not understand how or why it happened. Many Subie Newbies do not understand the unique nature of the boxer engine, so its natural for them to retort with a comment like “But the car has never been overheated” or “I shut it off as soon as I saw the gauge go above half, are you sure it’s a head gasket?”.
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