I don't expect perfection, especially on a well-used 18 year old car. However, I was glad to know that when they put a part that did not do the job well, they admit the error and replaced it with the correct part at no charge. Very unusual in our modern world of making excuses. I appreciated their honestly. It makes me trust their work, and that I will bring my 18 year old car back, if another problem turns up.