I've attempted to find a website for this business so that I could tell them directly (and not so publicly) why I won't use them anymore, but could only find this site.
Several months ago I took my car in for an oil change. A couple days later I smelled gas, and the following Saturday went back to Kwik Kar. It turned out the oil cap was missing. The employee told me it was because my oil cap "blew off." There was no damage to the hood of my car; I'm not a mechanic but common sense tells me that if oil pressure had built up to the point of blowing my oil cap off, I would have known it. This was obviously a case of just forgetting to put the cap back on. I would have respected admission of a mistake to put the oil cap back on, instead of blaming it on something else and insulting my intelligence. Two oil changes later (both at Kwik Kar), I again smelled gas, although this was close to two weeks after the oil change. I opened up the hood and discovered that the cap had not been screwed tight and oil was coming out; I then noticed the oil on my garage floor that evening. I will never go to them again. Oil changes are what they do and they can't seem to do that well.