CAMPAIGN: ENG. OIL/FILT. REPL. - CHANGEPRIOR TO DELIVERY. GMC Truck GMC K Pickup

SUBJECT: ENGINE OIL/FILTER REPLACEMENT

MODELS: 1993 C/K TRUCKS (BELOW 8500 GVW) AND G VANS (BELOW 8500 GVW) WITH FLINT BUILT 5.0L (L03) OR 5.7L (L05) ENGINES (VIN CODE H & K)

GENERAL MOTORS HAS DETERMINED THAT CERTAIN 5.0L (L03) AND 5.7L (L05) ENGINES FROM THE FLINT V8 ENGINE PLANT HAVE ENGINE OIL MIXTURES THAT DO NOT MEET THE 5W-30 REQUIRED FUEL ECONOMY IMPROVEMENT FACTOR SPECIFICATION.

TO CORRECT THIS CONDITION DEALERS ARE TO CHANGE THE OIL AND REPLACE THE OIL FILTER ON AFFECTED VEHICLES PRIOR TO DELIVERY.

VEHICLES INVOLVED

INVOLVED ARE CERTAIN 1993 C/K TRUCKS AND G VANS EQUIPPED WITH 5.0L OR 5.7L ENGINES AND BUILT WITHIN THE FOLLOWING VIN BREAKPOINTS:

YEAR MODEL ENGINE PLANT FROM THROUGH ---------- ------ ----- ---- ------- 1993 C/K 5.0/5.7 FORT WAYNE PZ503175 PZ511691 1993 C/K 5.0/5.7 PONTIAC EAST PE502898 PE515488 1993 G 5.0/5.7 FLINT PF500101 PF502028 1993 C/K 5.7 JANESVILLE PJ700144 PJ711984 1993 C/K 5.7 OSHAWA P1504602 P1516615

THE SPECIFIC VEHICLES INVOLVED IN THIS CAMPAIGN HAVE BEEN IDENTIFIED BY VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS. THESE LISTINGS WILL BE MAILED TO ALL INVOLVED DEALERS WITH A PAPER COPY OF THIS MESSAGE IN APPROXIMATELY 1-2 WEEKS.

NOTICE:

PRIOR TO RECEIVING THE SPECIFIC VEHICLE LISTING, DEALERS MAY WISH TO CHANGE THE OIL AND FILTER ON AFFECTED VEHICLES. TO ACCOMPLISH THIS, THE TABLE OF INVOLVED VEHICLES AS LISTED BELOW MUST BE USED IN SOME VEHICLE/VEHICLE PLANT CATEGORIES. A CHECK OF THE ENGINE STAMP ON THE FRONT RIGHT SIDE OF ENGINE BLOCK MUST BE DONE TO VERIFY WHETHER THE ENGINE IS FROM FLINT OR ST. CATHARINES ENGINE PLANT. ONLY ENGINES FROM FLINT IDENTIFIED BY THE LETTER "V" IN THE FIRST POSITION OF THE STAMP REQUIRE THE OIL AND OIL FILTER CHANGE.

VEHICLE ASSEMBLY PLANT VIN NUMBER J:

1993 C/K TRUCK WITH L05, AND LESS THAN GVW 8500 LB. PJ700144 THROUGH VIN PJ711984 (GMC) NO ENGINE BLOCK STAMP CHECK REQUIRED

VEHICLE ASSEMBLY PLANT VIN NUMBER 1:

1993 C/K TRUCKS WITH L05 + MG5 + NA5/NA6 - NM8, AND LESS THAN GVW 8500 LB. BEGINNING VIN P1504602 THROUGH VIN P1516615 (GMC) NO ENGINE BLOCK STAMP CHECK REQUIRED

VEHICLE ASSEMBLY PLANT VIN NUMBER E:

1993 C/K TRUCKS WITH L03 OR L05, AND LESS THAN GVW 8500 LB. PE502898 THROUGH VIN PE515488 (GMC) VERIFY ENGINE BLOCK STAMP FOR LETTER "V" PRIOR TO CHANGING OIL AND FILTER

VEHICLE ASSEMBLY PLANT VIN NUMBER Z:

1993 C/K TRUCKS WITH L03 OR L05, AND LESS THAN GVW 8500 LB. PZ503175 THROUGH VIN PZ511691 (GMC) VERIFY ENGINE BLOCK STAMP FOR LETTER "V" PRIOR TO CHANGING OIL AND FILTER

VEHICLE ASSEMBLY PLANT VIN NUMBER F:

1993 G VANS WITH L03 OR L05, AND M30 PF500101 THROUGH PF502028 (GMC) NO ENGINE BLOCK STAMP CHECK REQUIRED -----------------------------------------------------------------

DEALER CAMPAIGN RESPONSIBILITY

ALL UNSOLD NEW VEHICLES IN DEALERS' POSSESSION AND SUBJECT TO THIS CAMPAIGN MUST BE HELD AND REPAIRED PER THE SERVICE PROCEDURE OF THIS CAMPAIGN BULLETIN BEFORE OWNERS TAKE POSSESSION OF THESE VEHICLES.

OWNERS OF VEHICLES RECENTLY SOLD FROM YOUR NEW VEHICLE INVENTORY ARE TO BE CONTACTED BY THE DEALER AND ARRANGEMENTS MADE TO MAKE THE REQUIRED CORRECTION ACCORDING TO INSTRUCTIONS CONTAINED IN THIS BULLETIN.

IF THE NAME AND ADDRESS OF THE OWNER OF AN INVOLVED VEHICLE WAS UNAVAILABLE TO GMC TRUCK DIVISION AT THE TIME OF CAMPAIGN INITIATION, THE DEALER MUST DETERMINE THE OWNER'S NAME AND ADDRESS FROM THE DEALERSHIP SALES RECORDS. PLEASE PROVIDE THIS INFORMATION DIRECTLY ON THE SECOND COPY OF THE LISTING NEXT TO THE APPLICABLE VIN SO THAT OUR RECORDS MAY BE UPDATED AND THE APPROPRIATE NOTIFICATION MAILED TO THE OWNER. THIS SECOND COPY SHOULD THEN BE SUBMITTED TO THE ADDRESS LISTED BELOW IN THE PREVIOUSLY SUPPLIED YELLOW CAMPAIGN ENVELOPES.

GMC TRUCK DIVISION GENERAL MOTORS CORPORATION 101 UNION STREET PLYMOUTH, MICHIGAN 48170

OWNER NOTIFICATION

OWNERS WILL BE NOTIFIED OF THIS CAMPAIGN ON THEIR VEHICLES BY GMC TRUCK DIVISION (COPY OF OWNER LETTER INCLUDED WITH PAPER COPY OF THIS MESSAGE.) A LISTING OF OWNER NAMES AND ADDRESSES WILL BE FURNISHED TO THE INVOLVED DEALERS TO ENABLE DEALERS TO FOLLOW UP WITH OWNERS INVOLVED IN THIS CAMPAIGN. THIS LISTING MAY CONTAIN OWNER NAMES AND ADDRESSES OBTAINED FROM STATE MOTOR VEHICLE REGISTRATION RECORDS. THE USE OF SUCH MOTOR VEHICLE REGISTRATION DATA FOR ANY OTHER PURPOSE IS A VIOLATION OF LAW IN SEVERAL STATES. ACCORDINGLY, YOU ARE URGED TO LIMIT THE USE OF THIS LISTING TO THIS CAMPAIGN.

SERVICE INFORMATION

1. DRAIN CRANKCASE.

2. REMOVE OIL FILTER.

3. CLEAN THE GASKET SEALING AREA ON THE ENGINE OIL FILTER MOUNTING SURFACE.

4. LIGHTLY OIL GASKET WITH CLEAN OIL AND INSTALL NEW FILTER.

5. AFTER THE OIL FILTER GASKET CONTACTS THE OIL FILTER MOUNTING SURFACE, TIGHTEN 3/4 TO 1 FULL TURN.

6. FILL CRANKCASE WITH 5W-30 OIL (5 QUARTS).

7. WITH ENGINE OIL AT PROPER LEVEL, RUN ENGINE AND THOROUGHLY CHECK FILTER AREA FOR LEAKS.

8. INSTALL "CAMPAIGN IDENTIFICATION LABEL."

PARTS INFORMATION

PARTS ARE TO BE OBTAINED FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO). TO ENSURE THAT THESE PARTS WILL BE OBTAINED AS SOON AS POSSIBLE, THEY SHOULD BE ORDERED FROM GMSPO ON A C.I.O. ORDER WITH NO SPECIAL INSTRUCTION CODE BUT ORDER UNDER AN ADVISE CODE (2).

MODEL PART NUMBER DESCRIPTION QUANTITY ----- ----------- ----------- -------- ALL 12345612 5W-30 ENGINE OIL 5 QUARTS

C TRUCK 6438384 OIL FILTER (PF35) 1 & G VAN

K TRUCK 25010908 OIL FILTER (PF51) 1 (4WD)

WARRANTY INFORMATION

DEALERS SHOULD SUBMIT AN ACCURATELY FILLED OUT WARRANTY REPAIR ORDER ON EACH VEHICLE COMPLETED UNDER THIS CAMPAIGN.

NOTICE: CLAIMS SHOULD NOT BE SUBMITTED UNTIL INVOLVED VEHICLE LISTING AND PAPER COPY OF THIS MESSAGE ARE RECEIVED IN APPROXIMATELY 1-2 WEEKS.

LABOR OPERATION *TIME TROUBLE NUMBER DESCRIPTION ALLOWANCE CODE --------- ----------- --------- -------

V7760 ENGINE OIL & OIL .3 HR 96 FILTER CHANGE

FOR DEALER TO RECEIVE ADMINISTRATIVE TIME ALLOWANCE ASSOCIATED WITH THIS CAMPAIGN, ADD 0.1 HOUR TO THE LABOR OPERATION TIME ALLOWANCE.

CAMPAIGN IDENTIFICATION LABEL

EACH VEHICLE CORRECTED IN ACCORDANCE WITH THE INSTRUCTIONS OUTLINED IN THIS CAMPAIGN WILL REQUIRE A "CAMPAIGN IDENTIFICATION LABEL". EACH LABEL PROVIDES A SPACE TO INCLUDE THE CAMPAIGN NUMBER AND THE FIVE (5) DIGIT DEALER CODE OF THE DEALER PERFORMING THE CAMPAIGN SERVICE. THIS INFORMATION MAY BE INSERTED WITH A TYPEWRITER OR BALL POINT PEN.

EACH "CAMPAIGN IDENTIFICATION LABEL" IS TO BE LOCATED ON THE RADIATOR CORE SUPPORT IN AN AREA WHICH WILL BE VISIBLE WHEN THE VEHICLE IS BROUGHT IN FOR PERIODIC SERVICING BY THE OWNER.

APPLY "CAMPAIGN IDENTIFICATION LABEL" ONLY ON A CLEAN, DRY SURFACE.

ADMINISTRATIVE PROCEDURE

PROCEDURES COVERING THIS CAMPAIGN ARE OUTLINED IN SECTION V OF YOUR DEALERSHIP'S "GM TRUCK CLAIMS PROCESSING MANUAL" #P9119.

Dear GMC Truck Owner:

General Motors has determined that certain 1993 C/K Trucks and G Vans are equipped with 5.0L (L03) and 5.7L (L05) gas engines built at one of our engine plants with incorrect oil. This engine oil mixture does not meet the 5W-30 required fuel economy improvement factor specification.

To correct this condition, dealers will change the engine oil and replace your oil filter. This service will be completed for you at no charge.

Instructions for performing this service have been sent to your GMC Truck dealer. Please contact your GMC Truck dealer to arrange a service date. Ask your dealer if you wish to know how much time will be needed to schedule, process and repair your vehicle.

If you have changed your oil and filter since taking delivery of your vehicle, please complete the enclosed postage paid owner reply card to indicate the campaign repair has been completed and return the card to us. No further action on your part will be necessary.

The enclosed postage paid owner reply card identifies your vehicle. If the dealer performs the repair, presentation of the card to your dealer will assist in making the necessary correction to your vehicle in the shortest possible time. However, if you have sold or traded your vehicle, please furnish us complete name and address of the person you sold or traded your vehicle to and return the card to us.

We appreciate your cooperation and are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

GMC TRUCK DIVISION GENERAL MOTORS CORPORATION

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.