Oil Consumption

[ChrisAU]

No tune here.

 

[Faceplant]

That's interesting. Did the recall state what the actual cause was? Or whether that fixed the issues folks were having? That would definitely be some good to know.

---------- Post added at 08:20 PM ---------- Previous post was at 08:12 PM ----------

Also, I would recommend to anyone and everyone wanting to keep their trucks and not trade them in the next few years, and of course don't have the factory warranty still in effect. Consider rerouting the PCV system into a catch can setup that feeds back to the oil pan. By doing this you will not be redirecting the oil back into the intake and cylinders.

I think you may be on to something with the PCV system. This might also explain the rough idle many of us have, as too much oil is making its way back into the intake and fouling things like the TB. A catch can system is a good idea if for no other reason but to see if oil is accumulating in it.

 

[ChrisAU]

Well isn't a PCV system driven by the pressure created by the intake, hence why they all go there?

 

[domin8]

Somebody should do this and test it to see if it works.

 

[domin8]

Bump

Somebody asked if I knew the TSB on the engine oil consumption issue. The old TSB# was 10-06-01-008B. That was revised to 10-06-01-008C so as to include MY 2010 vehicles on 11/9/11. It looks like it's a pretty big issue as it includes all GMT-900 vehicles, including hybrid vehicles built after 7/7/2009. It also applies to MY 2008-2009 Pontiac G8 GT and 2010 Camaro. The following RPO codes with active fuel management are:

Aluminum Block: L94, LZ1, L99, LC9, LH6, L76, LFA, and L92
Cast Iron Block: LMG and LY5.

I hope this helps clarify all the garbage the dealers are giving everybody.

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[sumo]

Bump

Somebody asked if I knew the TSB on the engine oil consumption issue. The old TSB# was 10-06-01-008B. That was revised to 10-06-01-008C so as to include MY 2010 vehicles on 11/9/11. It looks like it's a pretty big issue as it includes all GMT-900 vehicles, including hybrid vehicles built after 7/7/2009. It also applies to MY 2008-2009 Pontiac G8 GT and 2010 Camaro. The following RPO codes with active fuel management are:

Aluminum Block: L94, LZ1, L99, LC9, LH6, L76, LFA, and L92
Cast Iron Block: LMG and LY5.

I hope this helps clarify all the garbage the dealers are giving everybody.

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nice. Gonna be hard to fight a customer that has done some research and with the Bulletin in hand.

#10-06-01-008: Engine Oil Consumption on Aluminum Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder) - (Aug 24, 2010)


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.

 

[domin8]

Looks like your service bulletin is a little outdated. The newest version I posted includes 2010 model year vehicles and cast iron block motors. Otherwise, everything else is pretty much unchanged.

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[sumo]

yea all it is is it includes up to 2010 like you said

 

[njracer]

Didn't see anything mentioned regarding 2011's but are there oil consumption issues with the 2011's?

 

[domin8]

Are there any 2011's over 30k miles yet?