1994 GMC Safari Owner's Manual - Page 261

Door weatherstrips and rubber hood bumpers should be wipedclean with a wet cloth and lightly coated with a rubber lubricant. Never use too much of any lubricant and be sure to wipe up anyextra lubricant when you are finished. Some parts that need lubricating are hard to get at. Windowregulators and controls are inside the doors.You can get to these by removing the trim panels. Refer to the Maintenance Schedule to determine how often to lubricate these items and what typeof lubricant to use. Lock Cy/inders To be sure your locks operate properly, they must be lubricated. Refer to the Maintenance Schedule to determine how often tolubricate them and what typeof lubricant to use. You should not use penetrating oils because they could wash the factory out installed lubricant and cause the lock to bind. De-icers which contain alcohol could also wash away the lubricant, so be sure to lubricate the lock after using a de-icer of this type. Exhaust System To help prevent damage to your exhaust system, do not continue to drive your vehicle if you notice: 0 Engine misfiring Loss of performance Other unusual operating conditions Have your engine and exhaust system serviced regularly. Three-way Catalytic Converter Your vehicle's three-way catalytic converter is designed to reduce the pollutants in your vehicle'sexhaust. Use only unleaded fuel in your vehicle. If you use leaded fuel, you could damage your three-way catalytic converter and other engine components. Engine Control Module System This system has an oxygen (02) sensor that helps keep yourengine's air-fuel mixture at a proper level. Use only unleaded fuelin your vehicle. If you use leaded fuel, you could damage your oxygen (02) sensor and affect your vehicle's emissions. 6-43