And it happened again a year later...

Driving home from the train station when I experienced loss of power plus tons of smoke out of the tailpipe. Towed it home and pulled the plugs which had a fair amount of oil on them.

I'm going to try and fix it myself this time but wanted to know if I should somehow try and clean the oil out of the combustion chamber or does it leak down when sitting and burn off when started after a valve cover replacement.