The mechanical components of the door assembly receive lubrication during the assembly. If any door hardware mechanism needs additional lubrication, use Lubriplate Spray-Lube A GM P/N 1052349, Lubriplate Auto-Lube A GM P/N 1052196, or a similar lubricant. Lubricate the door hinge pins and rollers at normal service intervals with a 30 SAE engine oil. Do not lubricate the hinge roller to hold-open link contacting surfaces. This may prevent the roller from rolling properly.