I have 2009 that the head was starved for oil and really did some damage. The dealer replaced the top end . What is going on now is the oil turns black in less than 400 miles. I wonder if the head going bad damaged the cylinder,piston or rings ? Would doing a compression and leak down test tell me anything? All that metal from the head had to go somewhere .
Cotton says : This is as screwed up as a rope with 3 ends