Document ID # 894549

2002 Chevrolet Corvette

Higher Than Expected Oil Consumption

(Replace Rings and Engine Valley Cover)

Subject: Higher Than Expected Oil Consumption (Replace Rings and Engine Valley Cover)
Source: Chevrolet Dealer Technical Service Bulletin
Number: 01-06-01-023A

1999-2001 Chevrolet Camaro

1999-2002 Chevrolet Corvette

1999-2001 Pontiac Firebird

with 5.7L. Engine (VINs G, S -- RPOs LS1, LS6)

This bulletin is being revised to add model years for the Corvette, information on the LS6 engine, and parts information. Please discard Corporate Bulletin Number 01-06-01-023 (Section 6 - Engine).


Some owners may comment on higher than expected oil consumption. When checked the oil consumption could be in the range or 400-600 miles per quart (700-1000 km/L).

On the LS6 engine only, the technician may find oil behind the engine throttle plate and in the intake manifold.


The cause for this condition may be an interaction between the piston rings and the cylinder bore in vehicles that are operated at higher RPMs -- typically manual transmission vehicles driven in a manner where the engine is frequently or consistently operating at greater than 3200 RPM.

On the LS6 engine only, the engine has a unique aluminum valley cover that has composite oil separating baffles and PCV plumbing incorporated. In some cases, the PCV baffles may not be properly sealed to the valley cover, causing oil to enter the PCV system.


On the LS6 engine only, replace the engine valley cover if oil is found behind the throttle or intake manifold before replacing the piston rings. Refer to Engine Valley Cover Replacement in the Engine Mechanical - 5.7L subsection of the Corvette Service Manual.

A new set of piston rings is currently available through GMSPO. The new rings are part of a complete piston ring kit. Install only the number 2 compression ring and the oil expander ring from the piston ring kit. All other rings in the kit should be discarded.


Do not dress or hone the cylinder bore. Nothing should be done to change the bore finish for this condition.
Changing the bore finish may aggravate the condition.

Refer to the Repair Manual for appropriate ring removal and replacement procedure.

The number 1 compression ring and the upper and lower oil expander rails are re-used because they are already broken in for the bore that they are in. The new number 2 compression ring is made with a very sharp edge that will break in quickly.

Changing only the piston rings noted, with no change in driving style, should change oil consumption to an acceptable level. Changes in driving style that reduce the amount of time spent at higher RPMs will also positively affect oil consumption.

In addition to the standard size piston ring kit listed below, a 0.25 mm oversized piston ring kit is available. The oversized piston ring kit should only be used in those rare instances where the cylinder bore size has been machined larger to accomodate the 0.25 mm over sized piston rings.

Parts Information

Part Number Description Quantity
12568002 Valley Cover 1
88984247 Ring Kit, Piston 8

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty use:

Labor Operation Description Labor Time
J0250 Manifold or Gasket Intake - Replace Manifold Use Published Labor Operation Time
J1307 Piston, Rod and/or Rings -- Replace Both Banks Use Published Labor Time

End of Bulletin #894549

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these 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 your GM dealer for information on whether your vehicle may benefit from the information.

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Creation Date: Friday, January 31, 2003
Last Modified: Friday, January 31, 2003
Copyright © Ray Smith, 2003