Many people ask: "Why trust and go with the maintenance schedule of a vehicle?" The obvious answer as to why use it, is because it will help the car run better and last longer. The answer as to why trust it is this: The maintenance schedule is made by the company that made the vehicle, Ford, GM, etc....These companies get new inventories of vehicles every year and they depend on trade-ins of vehicles instead of cash down payments to help keep the inventories moving. To help keep the business going. They, in turn, use the trade-ins to re-sell anywhere, in any car lot, that they can to keep making more money. If the car was not well maintained it will take a dealership more time and money to get it up to par, which will lower how much YOU get as a trade-in allowance, and take more time for the dealership to turn a profit. If you keep your vehicle maintained as the schedule suggests and keep records and all receipts of your visits to the mechanic, I can all but guarantee you will get a higher trade-in allowance than if you had not. This is the way auto companies want it.