Dod is so cool! While this doesn't affect our cars directly, I think the principle is the same. You can't just go and shut off engine parts and think everything is hunky dory.

Thanks,
Tom




Subject: Engine Oil Consumption on Aluminum Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder)

Models: 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT

2007-2008 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe

2007-2008 GMC Sierra 1500, Sierra Denali, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

2008 Pontiac G8 GT

Equipped with Aluminum Block V8 Engine with Active Fuel Management (AFM) (RPOs LC9, LH6, L76, LFA, L92)

with Greater than 45,000 km (28,000 mi)



________________________________________


Condition

Some customers may comment about engine oil consumption on vehicles with 45,000-56,000 km (28,000-35,000 mi) or greater. Upon further investigation, a technician may find that the engine uses 0.946 L (1 qt) of oil in as little as 1,200 km (800 mi). After this bulletin is completed, the vehicle should be driven 3,200-4,800 km (2,000-3,000 mi), then tested for oil consumption again.


Cause

This condition may be caused by an uncovered AFM valve that sprays oil on the bottom of the cylinders when the vehicle is in four cylinder mode. Over time, the rings cannot handle the volume and begin to stick with carbon. At that point, the vehicle oil usage may go up considerably.


Correction

A new AFM shield/ring cleaning process has been developed to restore the function of the rings. If the oil economy has not improved to no more than 0.946 L (1 qt) of oil consumed in 3200 km (2000 mi) after cleaning, it may be necessary to replace all of the pistons and piston rings.

Important: It is critical in this cleaning process that the engine/fuel injector cleaner remain in the cylinders for a minimum of 2.5 hours to fully clean the components. The cleaner solution must be removed before a maximum of three hours.
1. Verify the oil consumption concern following Corporate Bulletin Number 01-06-01-011F. If oil consumption is found, continue on with this bulletin.
2. Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
3. Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861802 (in Canada, use 88861804), in each cylinder. Allow the material to soak for at least 2.5-3.0 hours, but no more than three hours and then remove the cleaner. A suggested method of removing the cleaner is cranking engine over. Make sure to unplug the ignition coils and fuel injector before cranking the engine over. Also make sure that the painted surfaces are covered so no damage is done.
4. Remove the oil pan. Refer to Oil Pan Replacement in SI.


5. Remove the AFM valve (1).


6. Install the new shield (1), GM P/N 12639759, and tighten the AFM valve to the oil pan to 28 N•m (20 lb ft).

Important: Ensure that the engine cleaner is thoroughly removed before reinstalling the spark plugs. Failure to do so may result in a hydro-lock condition.
7. Reinstall the spark plugs.
8. Reinstall the oil pan. Refer to the Oil Pan Installation procedure in SI.
9. Re-evaluate the oil consumption. Document on the repair order. If the oil consumption is still greater than 0.946 L (1 qt) in 3,200 km (2000 mi), replacement of the pistons and rings will be required.

Parts Information
Part Number Description Qty
12639759 DEFLECTOR-OIL PRESS RLF VLV 1
88861802 (in Canada, use 88861804) CLEANER, F/INJR 16 OZ LIQUID POUR (Upper Engine and Fuel Injector Cleaner) 3



Warranty Information

For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
J7555* Install AFM Oil Deflector and Clean Carbon from Cylinder 3.5 hrs
Install AFM Oil Deflector and Clean Carbon from Cylinder (G8 Only) 10.5 hrs
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.

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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https://ls1tech.com/forums/ls4-front...ts-also-3.html

 

My engine uses a quart every 3500 miles but my plugs are as clean as they should be with the DOD plus having some deposits more than the non dod plugs; I thought that was to be expected. I also run my car on longs trips often.

 

"...while in 4 cyl mode..."


whew, good thing I haven't been in 4 cyl mode in 4+ years....

so, no worries..




.

 

In 4cyl mode only, yes siree. Hence, a reason in itself to get a tune to shut that crap off! If you want a 4cyl, I'm sure the Kia store has something just for you.

Tom

 

I haven't been in 4-cyl mode (for many miles) over the past couple of years and I still go through at least 1-2qts over 4-5k. Before my last oil change, I've hit the "low engine oil" twice...which has made me check the level a lot more often this time around.

 

I am closing in (fast) on 100K miles and it has burned oil since the day I picked it up with 72 miles on it. A quart every 1400 miles or so as I recall. Since tuning out DoD (AFM for you '07+ types), it has doubled that distance (at least) before I have to add.

 

Definately don't use a cam grind like mine if you don't want DOD! I average about 13mpg with it off and 19-20 with it on.