Every 3,000 miles or three months, the hinges and latch assemblies of the doors, the hood and trunk must be lubricated by a few drops of light oil or any lock lubricant. Moreover, the door latch strikers should be greased slightly to reduce their wear and ensure their fine working in the future. The function of the door and trunk locks is that they should be lubricated by using the spray on graphite lubricant.