That would be the closest size you'll find in metric. A 14-mm Allen wrench is a tiny bit too large and 13 mm just a tiny bit too small. Some have purchased a 14-mm and then ground it down a smidgen.Hemmo wrote:
BTW. Whats the size of the oilplug? 13 mm?
If you tire of trying to get the sump plug out and having to keep a supply of aluminum crush washers, you might want to consider buying a Quick Oil Drain Valve so you'll never have to take the plug out again. The FG-5 or FG-5N sizes (The 'N' version has a nipple on the end of the valve) are the ones for Rolls-Royce and Bentley motorcars from the Cloud/S period up through the SZ series cars.