Funny, mine started doing this about 2 weeks ago. Just a very light puddle in the driveway. I have it torn down in the garage right now to replace the intake manifold/-S/C plenum gaskets. No sign of leak or puddling. Nil a spot to find in the engine bay, nor a hint of the smell. Can't even find a drop point from underneath. Kinda baffling.
I am guessing, for now, that it's just overflow from my reservoir since my radiator is still topped off. We shall see.
Gary Noonan
'01 S/C VX / '18 Forester XT