My money's on 17mm.
I have a 92 Diamante Wagon. And the drain plug on my car is on the bottom left (driver side). You need a 22mm socket wrench to open it. Hope that helps.
It takes a 15mm wrench.
The 1997 Mitsubishi Diamante OBD 2 port is under driver side dash next to center console
not sure exact size but Mitsubishi is japenes, thersfore it is a mretic wrech u need
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.
15mm
draining a radiator of a mitsubishi space wagon
Using a suitable 15mm wrench turn the drain plug counterclockwise.
The original engine oil drain plug wrench size should be 15mm.
The 2006 VW Jetta oil drain plug will be on the bottom of the oil pan. You can remove the drain plug with a 9/16 wrench.
The engine coolant drain plug on a Mitsubishi V6 engine is located on the bottom of the radiator. This allows for coolant to be quickly and easily drained.