A fill up and an oil change

I was filling up the car. I don't know where I was, but I was a long way from Twin Falls, and I was filling up the car. The gas station offered auto services, and it was time for an oil change, so I asked for one. There service was to charge me for finding a place that did the actual service. I was miffed and said I could find a place myself that could give me an oil change for the price they quoted. The ugly slimy old shiister laughed in my face. "Go ahead and try" he says SO I DID