1998 GMC Safari Owner's Manual - Page 376

At Least Twice a Year ..._. Automatic Transmission Check Check the transmission fluid level; add if needed. See "Automatic Transmission"in the Index. A fluid loss may indicate a problem. Check the system and repair if needed. At Least Once a Year Key Lock Cylinders Service Lubricate the key lock cylinders with the lubricant specified inP r D. at Body Lubrication Service Wiper Blade Check Lubricate all body door hinges, the body hood, fuel door and rear compartment hinges, latches and locks including interior glove box and console doors, and any moving seat hardware. Lubricate the hood safety lever pivot and prop rod pivot. Part tells you what to use. D More frequent lubrication may be required when exposed to a corrosive environment. 7-42