How does the extended warranty on the Baja head gasket problem work? on 2006 Subaru Baja

I have 178,000 on my 2006. I saw they extended the warranty to 100,000 or 8 years. Is it whichever comes first? My head gasket is going out.

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2 answers
OUT OF WARRANTY BUT COMMON ISSUE
Mileage is over the limit.