Every 5,000 km, or every three months, the hinges and assemblies of the lock latches of the doors, hood and trunk lid should be lubricated with a few drops of liquid oil, or with a special grease for locks. The strikers of the locks are subject to lubrication with grease in order to reduce their wear rate and guarantee the failure-free actuation. To lubricate the lock assemblies, it is best to use a special graphite grease supplied in aerosol cans.