CAMPAIGN: REMOTE ENGINE OIL FILTER ADAPTER. Chevrolet S10 Pickup

Subject: REMOTE ENGINE OIL FILTER ADAPTER

Models: 1992-93 4-Wheel Drive S10 Trucks W/4.3L Engines

TO: ALL GENERAL MOTORS DEALERS:

General Motors of Canada Limited has determined that certain 1992-93 4-Wheel Drive (4WD) S 10 trucks and utility vehicles with 4.3L engines (RPO LB4 or L35; VIN Code Z or W) may have remote engine oil filter adapters that were improperly machined. The condition is internal to the adapter and would not give any outward indication of a problem. However, an improperly machined adapter could result in the engine oil not properly flowing through the oil filter and/or cooler (if equipped).

To correct this condition, dealers are to install a new remote engine oil filter adapter, and change the engine oil and oil filter.

VEHICLES INVOLVED:

Involved are certain 1992-93 4-Wheel Drive (4WD) S1O trucks and utility vehicles with 4.3L engines built within the following VIN breakpoints: PLANT YEAR MODEL PLANT CODE FROM THROUGH 1992 S 10 Chev W/4-WD Shreveport "8" N8100003 N8222713 1992 S 10 Chev W/4-WD Pontiac West "0" N0100003 N0164198 1992 S 10 Chev W/4-WD Moraine "2" N2100002 N2226379 1993 S 10 Chev W/4-WD Shreveport "8" P8100004 P8107350 1993 S 10 Chev W/4-WD Pontiac West "0" P0100005 P0103600 1993 S 10 Chev W/4-WD Moraine "2" P2100001 P2105818

1992 S 1O GMC W/4-WD Shreveport "8" SOP EOP 1992 S 1O GMC W/4-WD Pontiac West "0" SOP EOP 1992 S 10 GMC W/4-WD Moraine "2" SOP EOP 1993 S 10 GMC W/4-WD Shreveport "8" SOP P8501955 1993 S 1O GMC W/4-WD Pontiac West "0" SOP P0501057 1993 S 10 GMC W/4-WD Moraine "2" SOP P2501597

All affected vehicles have been identified by the VIN listing provided to involved dealers with this bulletin. Any dealer not receiving a listing was not shipped any of the affected vehicles.

DEALER CAMPAIGN RESPONSIBILITY:

All unsold new vehicles in dealer's possession and subject to this campaign must be held and inspected/repaired per the Service Procedure of this Campaign Bulletin before owners take possession of these vehicles.

Dealers are to perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, age of vehicle, or ownership, from this time forward.

Owners of vehicles recently sold from your new vehicle inventory with no owner information indicated on the dealer listing, are to be contacted by the dealer, and arrangements made to make the required correction according to instructions contained in this bulletin. This could be done by mailing to such owners a copy of the owner letter accompanying this bulletin. Campaign followup cards should not be used for this purpose, since the owner may not as yet have received the notification letter.

In summary, whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

OWNER NOTIFICATION:

All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors (see copy of owner letter included with this bulletin). The listings provided are for campaign activity only and should not be used for any other purpose.

PARTS INFORMATION

Parts required to complete this campaign should be ordered through regular channels, as follows:

Part Number Description Quantity/Vehicle

10236273 Oil Filter Assembly With Adapter 1 - For Vehicles NOT Equipped With Oil Cooler (KC4)

10236274 Oil Filter Assembly With Adapter 1 - For Vehicles Equipped With Oil Cooler (KC4)

NOTICE: KC4 Is Standard On L35 Engine (VIN Code "W") And Optional On LB4 Engine (VIN Code "Z")

993193 5W30 Engine Oil (1 Litre Can) 4.25 Litres

PARTS AND LABOR CLAIM INFORMATION

Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card or DCS transmission in accordance with the following:

Repair Code Description Time Allowance 2A Install Oil Filter Adapter Kit & Change Oil 0.5 (4.25 Litres) - Vehicle Not Equipped W/Oil Cooler

3A Install Oil Filter Adapter Kit & Change Oil 0.6 (4.25 Litres) - Vehicle Equipped W/Oil Cooler

Time allowance includes 0.1 hour for dealer administrative detail associated with this campaign. Parts credit will be based on dealer net plus 30% to cover parts handling.

SERVICE PROCEDURE:

1. Raise hood.

2. For L35 CPI (Central Port Injection) Engines, remove two (2) wing nuts from remote air cleaner box and move air cleaner box aside.

3. Disconnect engine oil lines from adapter. Save 0-rings for possible re-use at reassembly.

4. If vehicle is equipped with an engine oil cooler, disconnect oil cooler lines from adapter. Save 0-rings for possible reuse at reassembly.

5. Remove oil filter adapter from body with oil filter still attached.

6. Install new remote oil filter adapter assembly to body with new oil filter still installed to adapter as provided in kit.

7. Inspect both sets of 0-rings for cuts and other imperfections, and replace 0-rings (P/N 15564870) as required.

8. If vehicle is equipped with an engine oil cooler, reconnect oil cooler lines using 0-rings.

9. Reconnect engine oil lines using 0-rings.

10. Drain engine oil from crankcase.

11. Fill crankcase with new engine oil (approximately 4.25 Litres).

12. Run engine and inspect connections for leaks.

13. Install Campaign Identification Label.

14. Close hood.

INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.

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.