I just noticed that i have been using a ryco
Z63 oil filter for about 15,000Kms as picked out and ensured by an autobarn rep that it was indeed the right one for my Ford Focus 2007 (Duratec).
Have i caused any damage? I was running fully synthetic oil (Castrol Edge Sport 5W-30) at the time if that makes any difference.
(Remember being told jokingly that you don't even need oil filters for synth oils as there is no mineral "junk" floating about)
The correct one for my car is in fact the Z418, here's some comparative pics of the two.
As you can see the z63 is much longer/taller than the z418.
I honestly don't know how i didn't notice the difference when i was changing them out in the first place.. perhaps i overlooked it due to the filter being disguised in oil as it sat to drain..