Within my first week of doing my internship at the Mobil gas station in Auburndale ma. I have learned and worked on dozens of cars already. I have mostly been doing oil changes and filling fluids but I have also done brake jobs and the most complicated thing I have done is change a thermostat. The thermostat was the toughest job for me because I have never done one before and I was working on a pretty old truck so the nuts and bolts where very tight due to rust and corrosion.