I'm not sure if this is a coincidence or not-I used a groupon coupon for an oil change. About 1-2 weeks after the oil change, my service light went on. I had someone else fix the problem. My father wanted an oil change and so I told him to get it done at Auto Tech and bought a groupon and about 1-2 weeks later, his service light also went on. I still have one groupon oil change left and but I'm too scared to go back.
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(i).