My wife went to JiffyLub once several years ago for her car for the yearly car inspection. They told her that the oil looked very dirty and that she needed to get it changed as well as the air filter. She was a little bit surprised, as she knows that I am picky with car maintenance. I was traveling at that time and she could not get in contact with me so she got the job done. When she learnt from me later that I did change the air filter as well as the oil and oil filter only 2 weeks before myself she was really upset.