So wonder where that extra 2L of oil came from?
I've never had more than 5L drain out after a track event, it usually ends up coming out the BOV, getting in the intercooler or the piping.
How would fuel get in the oil?
Past the pistons. Either worn bores or worn rings, or both. Would explain all that smoke too, burning oil.
Took the spark plugs out,
#1 - Wet, Shinny and doesn't look good as far as I'm concerned.
#2,3,4 - Black
I have a feeling that the number 1 piston is going to have a great story to tell.