See Figures 1, 2 and 3
For lock cylinders, apply graphite lubricant sparingly thought the key slot. Insert the key and operate the lock several times to be sure that the lubricant is worked into the lock cylinder.
Hinges should be sprayed with a silicone lubricant on the hinge pivot points to eliminate any binding conditions. Open and close the door several times to be sure that the lubricant is evenly and thoroughly distributed.
On tailgates, spray a silicone lubricant on all of the pivot and friction surfaces to eliminate any squeaks or binds. Work the tailgate to distribute the lubricant
Be sure that the body drain holes in the doors and rocker panels are cleared of obstruction. A small screwdriver can be used to clear them of any debris.