I arrived at A Master with all intentions of making an appointment to have the rear differential in my truck serviced due to an annoying shudder while accelerating. I happened to meet Marty outside of the shop while parking and he asked how he could help. I told him about the troubleshooting I had done to date and he recommended that I try a differential additive that absolutely corrected the problem. Marty didn't have to share his knowledge and could have very well let me make the appointment and done the same thing he recommended, but it's this kind of personal service that will make me return should I ever need future servicing of my vehicles. Thanks Marty!