For 1990-2009 cars

# SERVICE MANUAL UPDATE SEC. 0B MAINTENANCE & LUBRICATION

#### SUBJECT: SERVICE MANUAL UPDATE (ENGINE OIL VISCOSITY CHARTS)

#### MODELS AFFECTED: 1991 CUTLASS CIERA, EIGHTY-EIGHT, NINETY EIGHT

1991 CUTLASS CIERA/CRUISER SERVICE MANUAL: ------------------------------------------ Page 0B-4 Figure 3 only applies to the 2.5L (VIN R) engine. The chart below was not included in the service manual and applies only to the 3.3L (VIN N) engine.

#### 1991 88 AND 98 SERVICE MANUALS:

Page 0B-1 of bothe of these service manuals contains and error. At the end of the left-hand column, the reference to "5W30" should be crossed out. 5W30 is an acceptable viscosity but only within a certain temperature range. The correct engine oil viscosity recommendations are shown on page 0B-4 within Figure 4 or as shown below.

Please mark a reference to this bulletin in you copies of the affected service manuals.

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.