I had my trusty Seat Ibiza go for it's MOT on Satuday (failed due to worn tyres

) but that's not what worried me.
For a little while now, it's been milking up around the oil cap. I also seem to have lost a little bit of oomph lol
I've tried flushing the engine and changing oil filters and such but nothing seems to make any difference
I also know it's not the head gasket as I'm not losing any water.
The guy at the garage said it's normal for it to do it a little bit due to condensation but it seems a bit excessive to me
Anyone have any advice on what else I could check/change?
Thanks