Once the car has travelled 3000 miles or in every 3 months, it is advisable to apply few drops of either light oil or lock lubricant to the hinge and latch assemblies on the doors,
Hood and trunk. Also, the door latch strikers should be lubricated with thin layers of grease so as to reduce wear and to enhance smoothness. The other part that should be lubricated is the door and the trunk locks which can be done using the spray-on graphite lubricant.