Formally called the Chevrolet C/K, C/K is a series of trucks manufactured by General Motors and marketed under the Chevrolet and GMC brands. The C/K line includes pickup trucks, medium-duty, and heavy trucks.
The 1998 Chevrolet C/K Full-Size Pickup Owner's Manual. 111 ... This section tells you when to perform vehicle maintenance and what fluids and lubricants to use.