SERVICE MANUAL UPDATE SEC. 0B MAINTENANCE & LUBRICATION

SUBJECT: SERVICE MANUAL UPDATE - SECTION 0B - MAINTENANCE AND LUBRICATION (ENGINE OIL VISCOSITY CHARTS)

MODELS AFFECTED: 1991 CENTURY MODELS

SERVICE MANUAL UPDATE - SECTION 0B

The following two engine oil viscosity recommendation charts replace Figure 3 in the 1991 Century Service Manual.

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.