Sump plugs, a subject often discussed I'm sure. My wee aluminium sump'd 1.0 litre 95Hp 3 cylinder Ibiza has a quite long, M14 x 1.5 plug with a non removable steel washer. It's about twice the length of the one, same diameter and thread, that was used in my old 1.9 tdi VE steel sump'd Cordoba...