On the 2 litre engine (2005 and later), 13mm.
15mm
15mm
the bolt is 15 mm
12 millimeter
5/8"
5/8
11/16th
Use a proper size box-end wrench or socket to remove the oil drain plug
Mine is 12mm wrench, but some are different.
13 mm on my 2002 Ford Ranger 4.0 XLT
5/8"
Every car and truck is different however most ford vehicles have a 13mm or a 15mm drain plug. I would use a wrench to remove and install the drain plug since it is easy to damage the pan if it is overtightened. If the plug has been replaced, it may have a different size.