INFORMATION ON ENHANCED PF 52 AND PF 1218 OIL FILTERS. Chevrolet Astro

SUBJECT: INFORMATION ON ENHANCED PF 52 AND PF 1218 OIL FILTERS

MODELS: 1986-94 CHEVROLET AND GMC C/K, S/T, M/L, R/V, AND G TRUCKS 1991-94 OLDSMOBILE BRAVADA

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * THIS BULLETIN CANCELS AND SUPERSEDES BULLETIN 476502 TO CORRECT * * THE CATEGORY IDENTIFIER/GROUP REFERENCE. PLEASE DISCARD BULLETIN * * 476502 (GROUP REFERENCE 6E - ENGINE FUEL + EMISSION). * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

AC ROCHESTER WILL BE SUPPLYING A LIMITED NUMBER OF NEW OIL FILTERS WITH ENHANCED ANTI-DRAINBACK VALVES TO GMSPO. OIL FILTERS WITH EFFECTIVE ANTI-DRAINBACK VALVES MAY REDUCE OR ELIMINATE SHORT DURATION COLD KNOCK. DUE TO LIMITED PRODUCTION CAPACITY, THE NEW FILTERS ARE ONLY TO BE USED ON THE FOLLOWING SPECIAL CASES.

1. TRUCKS OR VANS WITH SHORT DURATION COLD KNOCK. 2. ROUTINE MAINTENANCE OF 1994 TRUCKS OR VANS.

USE THE EXISTING PF 52 (P/N 25012760) AND PF 1218 (P/N 25013977) OIL FILTERS FOR APPLICATIONS OTHER THAN THE SPECIAL CASES LISTED ABOVE.

PART INFORMATION:

FOR "COLD KNOCK" VEHICLES OR 1994 VEHICLE MAINTENANCE

DESCRIPTION PART NUMBER REPLACES ----------- ----------- -------- PF52 25160560 PF51 PF1218 25160561 PF35

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

FIGURES: 0

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.