Dear DuckMuck:
There are 2 main reasons to change the oil before leaving:
1) Your car is ALMOST due for an oil change (5000Kmiles).
2) Leaving the old oil in your car for 2 months (and it's cold where you are) will cause sludge and dirt to settle down at the bottom of the oil sump, possibly forming a hard crud (not good). So you would better off changing it before leaving.
Best regards,
Eric
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