For 1990-2009 cars

# NEW SPARK PLUGS RELEASED REDUCES PLUG BOOT STICKING

#### SUBJECT: INFORMATION CONCERNING NEW SPARK PLUGS

MODEL/YEARS: 1992 ACHIEVA, CUTLASS CIERA, EIGHTY EIGHT, NINETY EIGHT, TORONADO, AND SILHOUETTE

In February of 1992, a new spark plug was released in production for vehicles with the 3300 MFI, the 3800 TPI, and the 3800 Supercharged (VIN N, L, 1) engines to improve the spark plug to spark plug boot connection. Oldsmobile vehicles using these engines are listed in the tide above.

Exposure to underhood temperatures over periods of time has the tendency to increase the bond between the boot and the spark plug ceramic. In the past, different lubricants have been used in the spark plug boots with varying suc- cess. This new spark plug was released to reduce this bonding condition and to improve the dielectric strength between the plug and the boot.

This new spark plug can be visually identified by its smooth ceramic surface, (the ridges have been removed) see figure 1. These new spark plugs have an anti-stick coating baked onto the spark plug's outer ceramic surface. This coating is clear with a slightly waxy feel. To further help identity the new spark plug, the type number has been changed to 41-600 from R45LTS6. The 41-600 is recommended to service all 1992 models listed above.

To maintain the reduced bonding characteristics, the Service Replacement Spark Plug 4l-600 must be used. The Service Package part number is 5614253. These spark plugs are currently available from GMSPO.

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.