Oil Drain Plug Hex Size..?

I can't recall off the top of my head but (I think it's 14mm), if you still have the original tool kit there should be a tool in there that fits it.

 

14mm but it tends to be a sloppy fit. 1/2mm bigger would be better.

 

9/16" might fit the bill.

 

I was going to say that but couldn't remember what 9/16 is in metric. I think it's pretty near 14.5mm

 

Just under 14.3