In my 35 years of experience, and working in the business. There is no $15.00 - $20.00 oil change service. In my professional opinion, Oil change service should not be used as a gimmick to get your vehicle into a shop. Price will vary from vehicle to vehicle. There is no 60-70 % of all vehicles’ taking same amount of fluids and filter anymore. Today’s vehicles are specialized to the point of different oil viscosities and even specific brands. Spin on filters v/s cartridge filters. All of these have different costs which effect oil service price. Also it should be a service of the vehicle, so what is done and who’s doing it has a big effect on price.