This is extremely poor response from Lexus. For me, I don't think I'll ever buy another Lexus, I'm afraid. I bought mine as a demonstrator in 2008, model year 2007, and it was in immaculate condition, with only 2-3k on the clock. It has always been garaged, since I bought it.
Sure, it's an old car, but that is no excuse. I have a Corolla of similar vintage, no problems with it and it has been left out in the sun a lot.
This, along with the burning/consuming oil issue, is just not what one expects from Lexus.