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Could it be getting in there by other means? If you're not losing coolant (out the tail pipe) and not getting any water in with your oil, and it's not a significant amount either...might not be your head gasket?
If its engine oil, and it's only going one way, it would have to be oil under pressure...or it would go both ways or the other way. A crack or a leak somewhere between the oil pump and anything it supplies.
I assume you have a manual trans with those kind of MPG numbers...but if you didn't, it could be the oil cooling line for the trans in through the radiator. There any other possible routes of contamination that come to mind?
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