Re: 1.4 16v catch cat
If you've got oil in the TB then it's worth trying to find out why.
Most likely cause is that there's too much oil in there. My old JTD blows oil into the manifold if you fill it anywhere around full, so I run it around 80% and that keeps things cleaner.
Another one (much less likely but more dramatic); if you have a slightly dodgy head gasket that might let gas into the oil, which pressurises the crankcase and pushes the oil out through the vent.. so if you're burning oil a bit, that might be one to further investigate.
Ralf S.