For 1990-2009 cars

The mechanical components of the door are lubricated during assembly. If additional lubrication is necessary, use the following lubricants:

• | Use Multi-purpose Lubricant GM P/N 12345120 or synthetic SAE 5W-30 engine oil on the door lock cylinders.

• | Use SAE 30 engine oil on the door hinge pins and the rollers at normal service intervals.

• | Use Lubriplate Spray-Lube A GM P/N 1052349 or Lubriplate Spray-Lube A GM P/N 1052196 on the remainder of all of the door hardware mechanisms, except for the lock assemblies.