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Old 11-19-2011, 09:16 AM   #1 (permalink)
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2006 impala ss with major oil consumption!

Anyone else having this problem. Car only has 48000 miles on it. It's burning around 1qt per 1000 miles. After doing some internet searches it seems to be the DOD or AVF. Does anyone know of a programmer that can eliminate the DOD and just keep it in 8cyl. mode. Thanks.


Last edited by Jeckyl; 11-19-2011 at 09:17 AM.. Reason: add mileage
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Old 11-19-2011, 09:29 AM   #2 (permalink)
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One quart per every 1,000 miles is considered normal by car manufacturers.

Check for oil leaks.

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Old 11-19-2011, 09:54 AM   #3 (permalink)
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That is true, but not by my standards. Only does this when going on long trips and the Dod is being used.

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Old 11-19-2011, 10:21 AM   #4 (permalink)
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Agreed, but to car manufacturer standards, it's normal. Make sure you use the recommended proper oil that meets the GM-6094M motor oil standard. Check the PCV valve to be sure it is not gummed up/stuck, from using petroleum based oils, as a stuck PCV valve can over-pressurize the oil crankcase forcing oil up into the combustion chambers where it is burned and sent out the tailpipe. When you hold the PCV valve and shake it, it should make a very distinct rattling noise if it's not plugged. Again, look for oil leaks. A good performing synthetic oil can greatly reduce oil consumption as well.

Hope this helps.

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Old 11-19-2011, 05:29 PM   #5 (permalink)
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Look up diablo tuners. They will boost performance and give you the option to remove the DoD. Removing DoD should remove the oil issue. Worked in mine

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Old 11-20-2011, 06:19 PM   #6 (permalink)
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Quote:
Originally Posted by straitchev View Post
Look up diablo tuners. They will boost performance and give you the option to remove the DoD. Removing DoD should remove the oil issue. Worked in mine
That's what I've been told if I eliminate the DOD it should fix my oil issues. How is ur mpg now? Thanks for the Diablo tip.

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Old 11-20-2011, 09:47 PM   #7 (permalink)
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I have the same problem. I just fill it with oil tho. I would however like to know how the mileage is without dod since that's the main reason I don't want to tune it out.

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Old 11-21-2011, 04:10 AM   #8 (permalink)
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I do a lot of highway miles and thought the cost of engine longevity was more important than MPG. I didnt see a difference in MPG with the DoD off. I might not be the best one to answer. Along with tune I did a full tune up and went from 87 octane to 91

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Old 11-21-2011, 05:02 AM   #9 (permalink)
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Quote:
Originally Posted by 1969 Impala View Post
One quart per every 1,000 miles is considered normal by car manufacturers.

Check for oil leaks.
Not quite. GM classifies 1 qt per 2000 miles "normal", but also says that running the car hard (over 3000 rpms) can cause higher consumption.

1 quart per thousand is high even for GM. My caddy was consuming 1 qt per 1000 and they basically rebuilt my whole engine under warranty... timing chain, piston rings, valve seals, etc.

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Old 11-21-2011, 08:18 AM   #10 (permalink)
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I thought they were only calling it normal to avoid a recall....

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Old 11-21-2011, 08:32 AM   #11 (permalink)
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Not sure what you mean? Of course GM and all auto-makers will say whatever they can to save themselves some money.

My point is that even by GMs standards, the OP is burning much more oil than normal. 1 Qt per 1000 miles is exactly double the maximum 'normal' oil consumption.

I had posted the evidence of that statement in another oil consumption thread. Ill try to dig it up.

http://www.impalaforums.com/8th-gen-...oil-usage.html

^Here it is, post #34 in the thread. note to the OP that searching for this thread took me all of 15 seconds. "juss sayin"

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Old 11-21-2011, 10:40 AM   #12 (permalink)
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How could DOD affect oil consumption? Gas mileage I understand, but I just can't see any way that it would burn extra oil.

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Old 11-21-2011, 04:23 PM   #13 (permalink)
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How could DOD affect oil consumption? Gas mileage I understand, but I just can't see any way that it would burn extra oil.
Not quite sure either, but from what I've read it's only DOD engines with this issue. Something with oil gathering in cylinders once DOD is activated . Once DOD is disabled oil consumption goes away.

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Old 11-22-2011, 08:19 AM   #14 (permalink)
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Quote:
Originally Posted by Jeckyl View Post
Not quite sure either, but from what I've read it's only DOD engines with this issue. Something with oil gathering in cylinders once DOD is activated . Once DOD is disabled oil consumption goes away.
That may be true, but GM (and other manufacturers) have this issue with non DOD engines as well. ie. Northstar. Ironically, my 4.6 N* burns about 1/2 quart every 1500 miles, yet my SS 5.3 DOD burns absolutely nothing. And I drive the SS a lot harder. Dino in the N*, Mobil1 in the SS - does that make a difference? Who knows......... What type of oil do you use Jeckyl?

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Old 11-22-2011, 10:25 AM   #15 (permalink)
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Oil gathering in the cylinders doesn't explain it either, that oil would still get there with or without the DOD, it would just burn right away rather than waiting for the cylinder to reactivate. I'm not sure dino vs synthetic makes sense either, but what weight of oil is being used?

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