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Ask GM Tech (Cam) Your Own Question

GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27644
Experience:  GM Grand Master Technician 2007. 11 years experience.
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my 2007 gmc yukon is using excessive amounts of oil. I havent

Customer Question

my 2007 gmc yukon is using excessive amounts of oil. I haven't even gone 2000 miles since my last oil change and my oil was so low it almost didn't register on the dip stick. Any ideas why this is happening.
Submitted: 5 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 5 years ago.

Welcome Paula. There is a bulletin regarding this issue with GM. Here is a copy of the bulletin.

#07-06-01-007B: Excessive Engine Oil Consumption (Verify Condition, Inspect Valve Stems, Replace Cylinder Heads, If Necessary) - (Jul 18, 2008)

Subject:Excessive Engine Oil Consumption (Verify Condition, Inspect Valve Stems, Replace Cylinder Heads if Necessary)

Models:2006-2007 Chevrolet Avalanche, Silverado Classic
2007 Chevrolet Impala, Monte Carlo, Silverado, Suburban, Tahoe, TrailBlazer
2006-2007 GMC Envoy, Sierra Classic
2007 GMC Sierra, Yukon, Yukon XL
2007 Pontiac Grand Prix
2006-2007 Saab 9-7X
with 4.8L or 5.3L V8 Engine (VINs C, B, Z, 3, M, T, 0, V, C, J -- RPOs LY2, L33, L59, LC9, LH6, LM7, LMG, LR4, LS4, LY5)

 


This bulletin is being revised to inform technicians that the old cylinder heads are no longer being requested/required to be sent back to WPC. Please discard Corporate Bulletin Number 07-06-01-007A (Section 06 - Engine/Propulsion).


Condition:

Some customers may comment on excessive engine oil consumption. The rate of oil consumption described may usually be around 0.946 liter (1 quart) of engine oil in 805 to 1125 km (500 to 700 mi).

Cause

The engine oil consumption may be caused by a nick in the valve stem.

Correction

Important: If one or more damaged valves are identified in one head, BOTH heads should be replaced.

Do This

Don't Do This

Inspect for excessive oil consumption.
Inspect all valves for damage and replace cylinder heads as needed.

Do NOT replace engine assembly or build up cylinder heads with SPO material.

Important: The completely built-up cylinder heads can be obtained from the Warranty Parts Center.

Complete the current SI diagnosis for any DTCs or symptoms found. Refer to Corporate Bulletin Number 01-06-01-011C for Information on Engine Oil Consumption Guidelines.

If excessive oil consumption has been verified, all of the valve stems need to be inspected for damage. One or more of the valve stems may be nicked.

After removing the valve cover, all the rocker arms need to be loosened to assure the valves are closed.

It is possible to see a nicked valve stem through the valve spring coil (a mirror and flashlight will be required), but in some cases the valve spring may need to be removed. Photos of a nicked valve stem are shown below.


Object Number:(NNN) NNN-NNNN Size: SH


Object Number:(NNN) NNN-NNNN Size: SH

A valve stem nick can be in any 360 degree area due to rotation, so each valve stem must be examined carefully.

If the engine oil consumption is excessive, and a nicked valve stem has been found, the cylinder heads will need to be replaced. The cylinder heads will be serviced as an assembly (the head will be complete with valves and springs) and shipped to the dealer by the Warranty Parts Center (WPC). The dealer will have to order the necessary parts/gaskets to complete the cylinder heads remove and replace. Refer to the Cylinder Head Replacement procedures in the applicable Engine Mechanical sub-section.

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