Lunar Low Automotive's Guarantee

I've taken my car to Lunar Low twice now for repair service. First time was for an assumed engine problem. They ran diagnostics and found nothing wrong. Never even charged me for the technician time. Today my battery was presumed dead and when I took the car there for a replacement, he told me that Auto Zone could replace it for considerably less than he'd have to charge. Again, no cost. This business hasn't made a nickel off me, but they'll have me as a loyal customer for any work that might need to be done in the future. If I could give them 20 stars, I would!