We would love to address both of your issues and get you happy again . . On the vibration, we have already agreed on a plan to do some 'advanced' wheel balancing to hopefully correct that . . . On the oil change cost, we understand your concern. The cost for a full synthetic oil change on your truck, especially with the 2 extra quarts that it requires makes it very pricey. You have an option to save by going back to the conventional oil change that you used to get until these last two. Just let us know how we can help.