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I like the Sears Craftsman 10mm 3/8 inch drive socket .. Part Number GK 42679. About $5...
With a extension and breaker bar, this tool mix fits and works much better than the 10mm Allen wrench alone..
Make sure you loosen the fill hole first. You don't want to get stuck with getting everything out of the drain hole and find you can't open the fill hole. Also, like many who have done this, I used Mobil1 75W-90, but there are many other alternatives. Good luck