Either the PCV is clogged or bad piston rings. run the car at idle and open the oil cap to see if any smoke(blow-by) comes out in large quantities. I little is OK and the PCV is probably clogged up. Lots of smoke? Run for the hills!! Car was probably overheated at some point. As for the misfire, having 2 bad coils would be very very unusual. maybe no compression or very little in those cylinders, that would account for the codes and blowing oil. Maybe you should look somewhere else. There are plenty out there for sale.