Cracked heads and failed head gaskets are actually fairly rare and are usually the result of severe overheating.
If the everything was fine until you found intermix, then I agree with Gilles and suggest checking the oil cooler as they are known to fail with this result.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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