The mechanical components of the door are lubricated during assembly. If additional lubrication is required to any door hardware mechanism, lubricate with Superlube GM P/N 12346241 or Canadian P/N 10953474, or equivalent. Lubrication of the door hinge roller is not recommended. Lubricating the door hinge roller may allow the door hinge roller to slide against the door check link contacting surfaces causing uneven wear to the door hinge roller.