It's the strangest thing...if an I-6 or V8 came into your shop you would think the engine was going to its grave but for some reason it isn't so with a 2.3 that is otherwise running properly and isn't smoking or knocking. While I wouldn't buy a 2.3 that exhibited this "air compressor" phenomenon unless I found it at a suitably discounted price, if I owned one I would just continue to drive it and not worry about it. Mark