Mine is 12mm wrench, but some are different.
15mm
12 millimeter
11/16th
5/8"
If you have the original factory tank, it has a drain plug (bottom center) you can remove with a wrench.
Sump drain plug is 13mm hexagon A 13mm 6 point socket will remove it.
With a wrench..7-8 open end.
Use a proper size box-end wrench or socket to remove the oil drain plug
What size line wrench for a 2005 freestar
If it's the "oil" drain plug, the size wrench is, better yet use a socket wrench=13mm.
If the drain plug is original equipment, it takes a 17mm wrench or socket.
The block drain plug is on the front side of the engine. It is located directly underneath the exhaust manifold. It takes a hex wrench to open it up.