Just purchased my first Corvette, a 2002 Coupe (6spd)...fantastic ride!
In checking my oil recently, I noticed it was down 3/4 quart in 800 miles. I just started reading about this "Oil Consumption Problem" in some of the model years.

Other than the mere inconvenience (of adding oil); can there be any "long term" damage to the engine as created by this problem?

Would using any oil other than Mobil 1, help the problem?

 

Other than a pain in the *** and you staay on top of it no but if it still under warranty get it to a dealer and have it checked out and if it persists see if you can get it in under the oil consumption testing program thaty had/have for this problem. It may qualify for a new ring job.

 

If you're losing it through the PCV system it's not great becasuse it sucks the oil into the intake. Search for "PCV catch can". If it's losing it past the rings it's not great either, though.

 

There is a TSB out on this so it is covered under warranty. I don't remember the TSB # but you will find it with a search. Just bring the car to the Chevy service center and they will start the process. They will start by topping off your oil then have you come back after 500 miles. When they determine you are consuming too much oil they will replace your rings and/or the engine valley cover (in the case of the LS6).

 

1999-2002: Service Bulletin: Higher Than Expected Oil Consumption
Subject: Higher Than Expected Oil Consumption (Replace Rings and Engine Valley Cover)
Source: Chevrolet Dealer Technical Service Bulletin
Number: 01-06-01-023A

Models: 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).

Condition
Some owners may comment on higher than expected oil consumption. When checked, the oil consumption could be in the range of 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.

Cause
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 baffle may not be properly sealed to the valley cover, causing oil to enter the PCV system.

Correction
On the LS6 engine only, replace the engine valley cover if oil is found behind the throttle body or in the intake manifold before replacing the piston ring. 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 piston ring kit should be discarded. The original number 1 compression ring and the oil ring rails should be re-used in their original positions on the piston. All pistons should be used in the same cylinder bore.

Important
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 Unit 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 accommodate the 0.25 mm oversized piston rings.

Parts Information

Part Number
Description
Qty

12568002
Valley Cover
1

88984247
Ring Kit, Piston
8

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


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.



© Copyright General Motors Corporation. All Rights Reserved.

 

Depending on the build date, you should have the new rings. If it is a very early car (first couple of weeks) then you may not. I would try switching oils first, then monitor. Mobil-1 has a relatively low Noack number so you will tend to lose more. Try the German Castrol 0W-30 or Amsoil 5W-30 to see if the consumption is reduced. This approach doesn't cost you anything but an oil change.

PS: My 02 oil consumption is very very minor, I won't say none but real close.

PSS: Also, make sure you check it the same way each time, I check mine cold. If you check after running the car, the results will be very erratic.

 

My advise...do the easy stuff first before having to hassle with a dealer. Put a catch can and see if this "consumption" is a result of the PCV system. If not, then pursue the ring TSB.

Good luck!

 

Is there a break point in the production of 2002 Corvettes when this ring problem was corrected...or do "all" the 2002 model year Corvettes have the problem?

Thanks again!

 

My '02 burns very little oil. I also have the Z06 PCV setup and catch can I installed but the engine never burned much oil prior to installing those. My build date is 10/23/01. Here's a great article by Hib Halverson detailing the problem.

http://idavette.net/hib/02ls6/page5.htm