Former Service Manager Tells All

Good Popular Mechanics article at (http://www.popularmechanics.com/cars/news/fuel-economy/confessions-of-a-car-dealership-service-manager-6311261). Service manager notes consumer ripoffs for “shop supplies” charges and part mark ups. Also notes to never buy “generic” service contracts / extended warranties — meaning those not backed by the vehicle manufacturer (Toyota / Ford, e.g.).