The stock oil drain plug size isa 5/8 or 16 mm....But that doesnt mean that is the size or that the plug wasnt replaced ....your best bet would be to purchase or bring with you under the jeep a socket or wrench set from ten mm to 19 mm set ( 10,11,12,13,14,15,16,17,18,19) and go from there...hope i helped.....
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