I have not seen/heard this being an common issue. You may want to do a search on this site to see if anything comes up.
What's much more likily is that your water pump impeller break due to age and end up blocking a water passages of the cylinder head which can lead to a cracked head and possible intermix of coolant and oil. Water pump replacement should be part of regular maintenance.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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