LUBRICATION OF LOCK CYLINDERS PROPER LUBRICANTS/PRECAUTIONS

MODELS: ALL TRUCK MODELS

Binding or inoperative door and tailgate lock cylinders may be due to a lack of lubrication which can be caused by the use of penetrating oils. These penetrating oils do not lubricate the cylinders, but wash out the factory installed lubricant. Penetrating oils are not to be used in any lock cylinders. In addition, materials which contain chlorinated propellants are not to be used on vehicles with a plastic cap around the lock cylinder. The chlorine attacks the plastic. Lock de-icers which contain alcohol to remove the moisture from the cylinders also tend to cut the existing lubricants. To maintain proper lubrication of lock cylinders, it is recommended that a light oil or graphite lubricant be used, such as Lock-Ease or equivalent. This is especially important if a lock de-icer was previously used.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.