My 2001 Vert (manual) is burning oil. I read everthing I could find on here and after measuring the oil consumption it's pretty obvious that I'm going through way too much. I filled it to the "full" line and it was half way to "add" when I checked it this morning, less than 50o miles of driving. Can it be anything but the rings? What is this going to cost me to fix?

 

Not cheap. I would do some serious upgrading if I were in your shoes. There are some pretty good deals on LS2 take outs. It would probably cost less than reringing your LS1.You could parts out your old motor to recoup a lot of your money.

 

My '01 6-spd used 1 quart every 800 miles and Chevy reringed it under warranty. That fived the problem. My '01 A4 does not use oil.

I hear the stock rings flutter at higher rpm under light load and blow oil. The MN6's seem to show the problem because of the way we tend to shift up in the 3000 to 3500 rpm range where the automatics usuall shift at lower rpm.

Changing your driving habits might make some difference but that's no fun. Living with it or have the rings replaced are two options. Maybe some others will chime in. GM had a service bulletin out on this. If you search the archives on this section you should find it.

Good luck with the problem.

 

Does it smoke when you start it? when you get on it? It could be valve seals. They are alot cheaper/easier than rings...might want to check that first.

 

MY 01 burned about 1.25 quarts every 800 miles. I had the rering under warranty which helped, but I still burn at the track - you should see the back of my car after 2 days . Normal driving I hardly burn any so I guess the rering worked.

I think the cost was around $2500 if I remember correctly. I could look it up though.

 

here u go

Document ID # 894549


2002 Chevrolet Corvette

Higher Than Expected Oil Consumption
(Replace Rings and Engine Valley Cover)
#01-06-01-023A

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).

Condition

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.

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 baffles 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 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.

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 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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