My81 240D fuel filter bolt is leaking so I went to the local dealer to get a new washer. As usual they gave me the wrong size! Their computer said 14mm, but when I saw it I knew it was way to small so I had them find the next size up (16mm). It also looked too small but I got 4 of them anyway because they swore that this was the largest size ever used on anything. Well, when I got home lo and behold the 16mm was too small!! So, does anyone know the right size or part# for this washer? FYI-even the Mercedes filter doesn't come with a new washer.-Scott