[freemansteve]

Is it possible the oil fill cap is leaky or incorrectly seated?

If the oil is clean, it may have been a spill from a previous top up, maybe?

I'm not sure where the crankcase breather pipe runs, or where the PCV lives, but either could possibly have a leak...

 

[freemansteve]

Not a spill then!
I'm hoping it's not a gasket, but something easier to sort, like the breather pipe (if it's anywhere near!). I assume it's the MPi engine and not a turbo model?