Have a 10' Altima 2.5S with 130k miles. Car is burning through oil super quick. Put in about 5 quarts every 900 miles. Got a new cat recently that was covered through Nissan's recall through my vin. No visible leaks/puddles. No smoke from the tail pipes. The tail pipes are black and have eroded as it appears, so possibly some issue related to that? Time for a new engine? New head gasket? Any insight appreciated.