Wow that sucks! Good luck cleaning that side of the engine. I would make it a project and replace the oil separator box and o-ring(s) as well, but you probably already have

I think my dad, who is a chemical engineer, told me once that antifreeze (I forget if it was ethylene glycol or propylene glycol) will help remove oil from concrete.... or was it his shoes? I forget, good luck all the same and thanks for the heads up.

Justin